P0037 o2 Sensor Heater voltage low
#1
Registered
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: Tempe, AZ
Posts: 251
Likes: 0
Received 0 Likes
on
0 Posts
P0037 o2 Sensor Heater voltage low
Hey guys-
I have a P0037 code for Bank 1 Sensor 2 (o2 sensor after the cat) heater voltage low. Just replaced my OEM cat with a Magnaflow cat/midpipe and reinstalled the original o2 sensor. It was coming back with this code, so I assumed something happened to the o2 sensor along the way. Today, I replaced it with a used o2 sensor, cleared the code and CEL is back with the same code.
While its possible this new(used) o2 sensor could have a bad heater, I feel its unlikely. I will have to double check the wiring now and see if there is a problem there. Was just wondering if anyone else has run into this code where replacing the sensor itself didn't resolve the problem.
Any advice would be appreciated.
Thank you,
Michael
I have a P0037 code for Bank 1 Sensor 2 (o2 sensor after the cat) heater voltage low. Just replaced my OEM cat with a Magnaflow cat/midpipe and reinstalled the original o2 sensor. It was coming back with this code, so I assumed something happened to the o2 sensor along the way. Today, I replaced it with a used o2 sensor, cleared the code and CEL is back with the same code.
While its possible this new(used) o2 sensor could have a bad heater, I feel its unlikely. I will have to double check the wiring now and see if there is a problem there. Was just wondering if anyone else has run into this code where replacing the sensor itself didn't resolve the problem.
Any advice would be appreciated.
Thank you,
Michael
#3
Registered
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: Tempe, AZ
Posts: 251
Likes: 0
Received 0 Likes
on
0 Posts
My midpipe has a catalytic converter though... You think both o2 sensors have the same problem with their heater? One thing I noticed as well is that if I clear the code, if I turn the ignition on just after it was cleared, that same code is already pending and will turn the light back on the second time the car is started.
#4
Registered
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: Tempe, AZ
Posts: 251
Likes: 0
Received 0 Likes
on
0 Posts
Anyone know any specs for this oxygen sensor? I'll have to get out the multimeter this weekend but don't know what specifications the sensor/wiring needs to be at?
Anyone that can help?
Thank you in advance,
Michael
Anyone that can help?
Thank you in advance,
Michael
#5
Registered
Thread Starter
iTrader: (3)
Join Date: May 2009
Location: Tempe, AZ
Posts: 251
Likes: 0
Received 0 Likes
on
0 Posts
For anyone that cares, or more importantly, those that have this DTC in the future. I measured my old o2 sensor and the used o2 sensor for resistance on the heater. No voltage at all so apparently the used o2 sensor I bought was junk. I purchased a universal o2 sensor from O'Reilly's, installed and the code has not come back yet today.
#7
If you have replaced the sensor and the code is still present follow these steps.
1. Remove rear O2 sensor connector inspect for poor connection (such as damaged/pulled-out pins, corrosion) since the sensor has been replaced check harness side.
2. Measure the voltage between rear HO2S terminal D (wiring harness-side, bottom left wire from rear of connector) and body GND with Key On. Is the voltage B+? Yes: Repair or replace the wiring harness for a possible short to power, clear codes and retest.
3. Inspect PCM connection (such as damaged/pulled-out pins, corrosion), if good clear codes, if codes return replace PCM.
Hope that helps
Braden
1. Remove rear O2 sensor connector inspect for poor connection (such as damaged/pulled-out pins, corrosion) since the sensor has been replaced check harness side.
2. Measure the voltage between rear HO2S terminal D (wiring harness-side, bottom left wire from rear of connector) and body GND with Key On. Is the voltage B+? Yes: Repair or replace the wiring harness for a possible short to power, clear codes and retest.
3. Inspect PCM connection (such as damaged/pulled-out pins, corrosion), if good clear codes, if codes return replace PCM.
Hope that helps
Braden
#8
Grey Boy
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
Is the code for the front O2 sensor different?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
I can erases the codes but they come back together on the next drive cycle.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
I can erases the codes but they come back together on the next drive cycle.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2.
I can erases the codes but they come back together on the next drive cycle.
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
not trying to hijack here but I would like to ask what the code for the front O2 sensor is.
Hi.
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2.
I can erases the codes but they come back together on the next drive cycle.
I checked my wiring and it's all good.
This code is listed to the rear O2 sensor. But the fact that I'm getting two codes leads me to question if the front sensor is bad as well.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
Is the code for the front O2 sensor different?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
I can erases the codes but they come back together on the next drive cycle.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
I can erases the codes but they come back together on the next drive cycle.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2.
I can erases the codes but they come back together on the next drive cycle.
I checked my wiring and it's all good so I figure it is the rear O2 sensor.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Why am I getting two exact codes?
I'm getting two P0037 codes. Both read HO2S Heater Control, Crct low bank 1 sensor #2.
I can erases the codes but they come back together on the next drive cycle.
I checked my wiring and it's all good.
This code is listed to the rear O2 sensor. But the fact that I'm getting two codes leads me to question if the front sensor is bad as well.
Is the code for the front O2 sensor different or the same as the rear O2 sensor?
Last edited by RIWWP; 03-27-2015 at 07:01 AM. Reason: posts merged
#11
No respecter of malarkey
iTrader: (25)
The only thing that matters is the DTC Code number. Anything else is irrelevant. Take that code number and look it up here:
http://www.revolutionrotorclub.com/f...ne_Control.pdf
Then page down go to the troubleshooting section for that code. P0037 troubleshooting starts on indicated Page 27. As stated, the P0037code is for Rear H2OS Heater Circuit Low. It tells you everything you need to know. However, you need a *known* good O2 sensor. Buying a used one you cannot always be 100% sure if its good or not depending on the situation (like a friend who took it off and it was fine then vs some person of unknown reputation on the internet).
http://www.revolutionrotorclub.com/f...ne_Control.pdf
Then page down go to the troubleshooting section for that code. P0037 troubleshooting starts on indicated Page 27. As stated, the P0037code is for Rear H2OS Heater Circuit Low. It tells you everything you need to know. However, you need a *known* good O2 sensor. Buying a used one you cannot always be 100% sure if its good or not depending on the situation (like a friend who took it off and it was fine then vs some person of unknown reputation on the internet).
#12
Grey Boy
Thanks to all.
I actually found the list and the two different codes for the front and rear sensors.
I still don't know why I'm getting two P0037 codes on my code reader.
I do not know "pending and freeze frame".
I only know that I get two codes at once. I clear them and they stay gone till I restart the car.
Then they return, together. One of two and two of two. Both P0037.
Has me hesitant about getting a new sensor if the problem could be something else.
I actually found the list and the two different codes for the front and rear sensors.
I still don't know why I'm getting two P0037 codes on my code reader.
I do not know "pending and freeze frame".
I only know that I get two codes at once. I clear them and they stay gone till I restart the car.
Then they return, together. One of two and two of two. Both P0037.
Has me hesitant about getting a new sensor if the problem could be something else.
Last edited by titaneum_grey; 03-27-2015 at 02:34 PM. Reason: Removed Redundant Sentence
#14
Grey Boy
in my search for an 04, Rear O2 Sensor.
Part No. N3H3-18-861B I have found on line
NEW BORG WARNER BWD 4W OXYGEN SENSOR MAZDA VEHICLES VARIOUS (Fits: Mazda RX-8)
$17:50
13772 234-4349 Oxygen Sensor Downstream for 2004-2008 Mazda RX-8 (Fits: Mazda RX-8)
$20:99
04 05 06 07 08 Mazda RX8 1.3L Rear Oxygen Sensor O2 N3H218861C9U 2344349
$56:95
04 05 06 07 08 Mazda RX8 1.3L Rear Oxygen Sensor Standard 6 Speed Bosch O2 NEW
$75:00
04 05 06 07 08 Mazda RX-8 1.3L Front Oxygen Sensor O2 NEW 15043 (Fits: Mazda RX-8)
$86:00
04 05 06 07 08 Mazda RX8 Rear Oxygen Sensor O2 NEW 22506 NEW
$90:23
And the dealership wants $204.
SMH
What is the difference?
Part No. N3H3-18-861B I have found on line
NEW BORG WARNER BWD 4W OXYGEN SENSOR MAZDA VEHICLES VARIOUS (Fits: Mazda RX-8)
$17:50
13772 234-4349 Oxygen Sensor Downstream for 2004-2008 Mazda RX-8 (Fits: Mazda RX-8)
$20:99
04 05 06 07 08 Mazda RX8 1.3L Rear Oxygen Sensor O2 N3H218861C9U 2344349
$56:95
04 05 06 07 08 Mazda RX8 1.3L Rear Oxygen Sensor Standard 6 Speed Bosch O2 NEW
$75:00
04 05 06 07 08 Mazda RX-8 1.3L Front Oxygen Sensor O2 NEW 15043 (Fits: Mazda RX-8)
$86:00
04 05 06 07 08 Mazda RX8 Rear Oxygen Sensor O2 NEW 22506 NEW
$90:23
And the dealership wants $204.
SMH
What is the difference?
#16
i have just got a rebuilt engine and i installed it myself and i am getting a P0037 and a P0172, the car will not hold an idle ive replaced the front o2 and it helped till it fouled out. so i replaced exhaust and upper intake gaskets, also i have new maf and its still running rich. i have an aem intake and a bhr mid pipe and have deleted my air pump, i also have bhr ignition coils. i can not figure out why its running rich and stumped and frustrated ive got about 300 miles on the rebuild
#17
sorry if this is necroe'ing a old thread...
I may be being paranoid here but i have been running catless for quite a while (2 years or so)
previously i was just getting a P0420 code which no issue really since i lost no power or MPG.
now recently i got a tuning program and told my ECU to stop checking for that code all together which made the CEL go away for a while then about 20 miles later it popped again
after i scanned it again i now have a P0037 code which is still just the rear O2 sensor that isn't there an still isn't putting me into limp mode or affecting my MPG any. my main concern is if this will cause an issue in the future of if i can just tell the ECU to stop scanning for this one aswell and continue on my merry way as usual
any input would be appreciate from people that understand the sensor and ECU safety protocols better than i do
I may be being paranoid here but i have been running catless for quite a while (2 years or so)
previously i was just getting a P0420 code which no issue really since i lost no power or MPG.
now recently i got a tuning program and told my ECU to stop checking for that code all together which made the CEL go away for a while then about 20 miles later it popped again
after i scanned it again i now have a P0037 code which is still just the rear O2 sensor that isn't there an still isn't putting me into limp mode or affecting my MPG any. my main concern is if this will cause an issue in the future of if i can just tell the ECU to stop scanning for this one aswell and continue on my merry way as usual
any input would be appreciate from people that understand the sensor and ECU safety protocols better than i do
#18
The same thing i have with mine. I delete the code p0037 and after i start the car again the check engine light is on with the same code. I have all original pipes and catalitics. I think are the wires that make the problem or the connection. I took out the ensor i check everything and i put it back again. I tarted the car and the same code is on. I changed the sensor with new one and again the same code. P0037.
also if it runs for some time or some kilometers sonetimes as u drive it looses power and the engine goes off. Have to wait so not to flood and start it again. After 30 or more minutes is ok.
i dont know maybe is the oxygen sensor again.
also if it runs for some time or some kilometers sonetimes as u drive it looses power and the engine goes off. Have to wait so not to flood and start it again. After 30 or more minutes is ok.
i dont know maybe is the oxygen sensor again.
#19
Registered
iTrader: (1)
If it loses power, stalls and doesn't restart until it cools down either your fuel pump is dying or your engine is dying.
Which sensor did you replace? P0037 refers to the one in the catalytic converter. If that's the one you replaced, then yes, the problem is somewhere in the wiring to it.
Is the car on its original engine? If you ever had the engine/transmission out, it's not unusual to damage the O2 sensor wiring when putting them back in.
Which sensor did you replace? P0037 refers to the one in the catalytic converter. If that's the one you replaced, then yes, the problem is somewhere in the wiring to it.
Is the car on its original engine? If you ever had the engine/transmission out, it's not unusual to damage the O2 sensor wiring when putting them back in.
#20
Yes i replaced the upstream sensor first time that was onother code and for 2 years it was very good no code engine power ok everything.
After the check engine light was on and the code p0037. I changed the downstream sensor but the check engine is still on and there are alot of problems when the car is hot. After driving for 30 minutes or some kilometers around 15 and more looses power the rpms goes down less than 500rpm
And the car sometimes if u stop at the lights is the engine off and u cannot start it after because it will flood. So u have to wait more than 30 minutes and it starts again normal. I changed coils, sparks, wires, sensors. There is no other check engine code. Only p0037.
After the check engine light was on and the code p0037. I changed the downstream sensor but the check engine is still on and there are alot of problems when the car is hot. After driving for 30 minutes or some kilometers around 15 and more looses power the rpms goes down less than 500rpm
And the car sometimes if u stop at the lights is the engine off and u cannot start it after because it will flood. So u have to wait more than 30 minutes and it starts again normal. I changed coils, sparks, wires, sensors. There is no other check engine code. Only p0037.
#21
Smoking turbo yay
Easy way to check is to see if your car has trouble revving to high RPM.
If your car struggles to accelerate to higher RPM, it's the fuel pump.
If your car feels just fine when accelerating to higher RPM, your engine could be the problem there.
If your car struggles to accelerate to higher RPM, it's the fuel pump.
If your car feels just fine when accelerating to higher RPM, your engine could be the problem there.
#22
If you have replaced the sensor and the code is still present follow these steps.
1. Remove rear O2 sensor connector inspect for poor connection (such as damaged/pulled-out pins, corrosion) since the sensor has been replaced check harness side.
2. Measure the voltage between rear HO2S terminal D (wiring harness-side, bottom left wire from rear of connector) and body GND with Key On. Is the voltage B+? Yes: Repair or replace the wiring harness for a possible short to power, clear codes and retest.
3. Inspect PCM connection (such as damaged/pulled-out pins, corrosion), if good clear codes, if codes return replace PCM.
Hope that helps
Braden
1. Remove rear O2 sensor connector inspect for poor connection (such as damaged/pulled-out pins, corrosion) since the sensor has been replaced check harness side.
2. Measure the voltage between rear HO2S terminal D (wiring harness-side, bottom left wire from rear of connector) and body GND with Key On. Is the voltage B+? Yes: Repair or replace the wiring harness for a possible short to power, clear codes and retest.
3. Inspect PCM connection (such as damaged/pulled-out pins, corrosion), if good clear codes, if codes return replace PCM.
Hope that helps
Braden
I am guessing I have a wiring issue but thought I would see if anyone had any suggestions as well.
Maldonado anyone know how many replies I have to have before I can start my own thread ? Annoying feature of the forum in my opinion
Thread
Thread Starter
Forum
Replies
Last Post
bmxer
Series I Aftermarket Performance Modifications
8
08-20-2007 06:43 PM