02 sensor??
08-25-2014, 10:41 PM
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02 sensor??
Recently found out that my o2 sensor was damaged and I had it replaced by a local mechanic. Noticed that the CEL was still on, so I took it to dealership, and they to said that the o2 sensor was still showing up on the codes. I have straight pipes added onto my 8, could this affect the CEL with the o2 sensor? Because it is still showing up on the codes but it has been installed properly
09-01-2014, 10:29 PM
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Okay ill check that out thanks, i honestly forget, ill have to check, but the CEL is still on and i have no other codes that were showing by the dealership, so it has to be the o2 sensor but its new :/.. So idk?
09-02-2014, 10:26 AM
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First, did you clear the code after getting the O2 sensor replaced? If not, then yes, it would stay on until it's cleared.
If you mean that it came back on, did you get the code?
There are >125 codes total.
11 of them are based on the front O2 sensor
9 of them are based on the rear O2 sensor
Which code it is makes quite a big difference on what the answer needs to be. For example, the code could be for something other than the O2 sensor. P0420, catalytic converter efficiency below threshhold, comes to mind. That means that the ECU doesn't see a cat. Or it could be P0037, rear O2 circuit low, which could mean that the shop that replaced the sensor messed up the wiring or connection. Or P0171, system too rich, because you haven't reset the fuel trims after replacing the O2 sensor.
Etc...
Give us the code, and we can help. We can't do much more than speculate and guess without the code.
If you mean that it came back on, did you get the code?
There are >125 codes total.
11 of them are based on the front O2 sensor
9 of them are based on the rear O2 sensor
Which code it is makes quite a big difference on what the answer needs to be. For example, the code could be for something other than the O2 sensor. P0420, catalytic converter efficiency below threshhold, comes to mind. That means that the ECU doesn't see a cat. Or it could be P0037, rear O2 circuit low, which could mean that the shop that replaced the sensor messed up the wiring or connection. Or P0171, system too rich, because you haven't reset the fuel trims after replacing the O2 sensor.
Etc...
Give us the code, and we can help. We can't do much more than speculate and guess without the code.
Last edited by RIWWP; 09-02-2014 at 10:28 AM.
09-04-2014, 06:57 PM
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okay so I got these codes right here, I got code p0130?? I think deals with the coolant maybe? Also got code p0031 Heated o2 sensor. Got the sensor replaced, code was cleared I believe. Once again, could it be that I have straight pipes, because CEL is still on.
09-05-2014, 08:08 AM
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Don't just randomly guess...
Taken together, your front O2 has some sort of wiring problem. Either the connector isn't actually plugged in, it's dirty, the wires are damaged, the wires are wired wrong (if you got a DIY wiring kit), etc...
DTC P0130
Front HO2S circuit problem
DETECTION CONDITION
The PCM monitors the front HO2S impedance when under the front HO2S heater control. If the impedance is more than 500 ohms, the PCM determines that there is a front HO2S circuit problem.
Diagnostic support note
This is an intermittent monitor (HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.
POSSIBLE CAUSE
Front HO2S malfunction
Connector or terminal malfunction
PCM malfunction
Front HO2S circuit problem
DETECTION CONDITION
The PCM monitors the front HO2S impedance when under the front HO2S heater control. If the impedance is more than 500 ohms, the PCM determines that there is a front HO2S circuit problem.
Diagnostic support note
This is an intermittent monitor (HO2S).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.
POSSIBLE CAUSE
Front HO2S malfunction
Connector or terminal malfunction
PCM malfunction
DTC P0031
Front HO2S heater control circuit low
DETECTION CONDITION
The PCM monitors the front HO2S heater control voltage when the PCM turns the front HO2S heater off. If the control voltage exceeds 50% of the battery voltage, the PCM determines that the front HO2S heater control circuit voltage is low.
Diagnostic support note
This is a continuous monitor (HO2S heater).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.
POSSIBLE CAUSE
Front HO2S heater malfunction
Connector or terminal malfunction
Short to power supply in wiring harness between front HO2S terminal D and PCM terminal 1V
PCM malfunction
Front HO2S heater control circuit low
DETECTION CONDITION
The PCM monitors the front HO2S heater control voltage when the PCM turns the front HO2S heater off. If the control voltage exceeds 50% of the battery voltage, the PCM determines that the front HO2S heater control circuit voltage is low.
Diagnostic support note
This is a continuous monitor (HO2S heater).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.
POSSIBLE CAUSE
Front HO2S heater malfunction
Connector or terminal malfunction
Short to power supply in wiring harness between front HO2S terminal D and PCM terminal 1V
PCM malfunction
09-05-2014, 06:05 PM
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Yeah i had a mechanic shop put in the new o2 sensor... And this is the code that it was reading and the mazda dealership had read this code also... So should i take it somewhere? Or what :/
09-05-2014, 06:28 PM
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Try disconnecting the O2 sensor, cleaning the connector, and reconnecting it.
Also, make sure you know exactly what sensor was purchased and installed. If it wasn't the right sensor, it could cause these problems.
Also, make sure you know exactly what sensor was purchased and installed. If it wasn't the right sensor, it could cause these problems.
09-05-2014, 08:51 PM
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Stop talking about straight pipes. The sensor in question is the FRONT sensor, not the rear one. Straight pipes are all AFTER the front sensor, and will not have any impact on it. They can cause their own CELs, but not the ones you have.
You have a wiring/electrical/compatibility problem with the front O2 sensor. Period.
You have a wiring/electrical/compatibility problem with the front O2 sensor. Period.
09-05-2014, 09:03 PM
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Okay thank you, I was just hoping it wasn't something to serious thats all. Im sorry, im new to the rx8 life, is this problem extra serious since it is a NEW sensor and can easily be fixed is basically what i want to know, i hope i dont have to re order a new one again or something
09-05-2014, 09:21 PM
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If you ordered an incompatible sensor before (it's not a common sensor, 'universal' ones usually don't work), then yes, you would have to re-order a correct one.
If it's just a dirty connector, no you won't have to order another. It could be a number of different things though, you are going to have to trace the harness for it, inspect the connector, clean it, inspect the harness to make sure it isn't melted or frayed, etc... Worst case, you have another $250ish sensor to order. It's a critical sensor though, you need to have it working correctly.
If it's just a dirty connector, no you won't have to order another. It could be a number of different things though, you are going to have to trace the harness for it, inspect the connector, clean it, inspect the harness to make sure it isn't melted or frayed, etc... Worst case, you have another $250ish sensor to order. It's a critical sensor though, you need to have it working correctly.
09-05-2014, 09:40 PM
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Okay, yeah i believe the shop i went to (precision auto tune)... When they seen my o2 sensor it was bent and needed replAcement. I actually do believe that they ordered a "universal" one so it could be there the next day.. So that actually could be the problem. Will give them a call tomorrow then.. Thank you very much, ill also check this one though just in case
09-05-2014, 09:44 PM
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Most universal sensors are narrow band. The RX-8 is somewhat unique in that the front sensor is a much more expensive wideband. There are universal wideband, but it has to still be very specific in the wiring and the internal specifications.
It's safest to just order a sensor from Mazmart, which will give you a better price than the dealer and you know you will get the right sensor.
It's safest to just order a sensor from Mazmart, which will give you a better price than the dealer and you know you will get the right sensor.
09-05-2014, 10:49 PM
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Seriously thank you for all the info, you know your stuff man! It just makes me mad.. Cus Precision claimed to have the p0031 code and after the new o2 sensor it had been cleared.. When i took it t mazda literally right after, they were reading the p0130 code, so its all confusing to me how that worked..
09-06-2014, 11:47 AM
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Bingo, there is the problem.
Do a site:rx8club.com google search for the part number and got this thread:
https://www.rx8club.com/series-i-tro...r-same-244222/
Do a site:rx8club.com google search for the part number and got this thread:
https://www.rx8club.com/series-i-tro...r-same-244222/
I understand that the front sensor is wideband heated and the rear sensor is narrowband.
After a bit more research, it seems that the Bosch 15043 is a narrow-band sensor and should only work as a rear o2 sensor.
After a bit more research, it seems that the Bosch 15043 is a narrow-band sensor and should only work as a rear o2 sensor.
09-06-2014, 01:46 PM
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Just got back from the shop, you were right. When they were ordering the new NTK front o2 sensor, the plAce they were ordering them from had also said for the rx8, this is the preferred o2 sensor. So should have it put in by wednesday!! Appreciate all the help!
09-19-2014, 01:41 AM
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OMG is all I can say. Finally swapped out the Bosch sensor for the NtK front o2 sensor... Makes a HUGE difference. Code is now gone, rough idle has gone away... Also cant smell the rich exhuast. And miles per gallon went up a great deal. Thank you everyone on this forum!!
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