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Limp mode causes???

Old 04-15-2011, 12:07 PM
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Limp mode causes???

Does anyone know if these codes will cause the car to go into limp mode and run extremely rich 10.9 AFR's??I know they are o2 sensor related, I just need to know if they would cause limp mode.

P0030
P0037
P0134

Thanks!
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Old 04-15-2011, 12:24 PM
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Old 04-15-2011, 02:22 PM
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Story to this is....while trying to remove the primary o2 sensor i stripped it out. Went to auto zone and all they had was a universal one that you spice it. Did that and now i get the 3 codes and rich smoke out the exhaust my Aem wide band gauge stays at 10.9 at idle and all the way up to 3500 rpm rev limit. Im starting to think this car can't use the universal sensor so i just ordered the real one for 300 bucks and it will be here tomorrow....i don't have the secondary one plugged in because i am using that hung for my Aem wideband gauge. That's the p0037 code. Anybody agree that the universal one does not work in the primary position because it might not be a wideband??
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Old 04-15-2011, 02:25 PM
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Limp mode? What is that? Never happens to me.
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Old 04-15-2011, 02:26 PM
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Mainly just tryingto figure out why limp mode. People have said they drive fine with both sensors unplugged...so why am i in limp mode...5% throttle body open no matter how much i put the pedal down. 3500rpms max. 0-50 max speed is about 35 seconds.....horrible....
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Old 04-15-2011, 02:28 PM
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Originally Posted by UrbanOcho View Post
Limp mode? What is that? Never happens to me.
Its the ecu making the car slow as he'll to limp it to the dealership to get fixed. Its horrible.....
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Old 04-15-2011, 02:30 PM
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oh my mind is in the gutter sorry
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Old 04-15-2011, 02:40 PM
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haha oh Urban....

Universal O2 sensors aren't recommended. Our 8 is very touchy. Where did you get the part for $300?? You should try Mazmart for a better price!!
http://mazmart.com/ItemDetail.aspx?id=813
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Old 04-15-2011, 02:58 PM
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Autozone....and i needed it asap so i just bought it....hope this works.....
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Old 04-16-2011, 07:40 AM
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I've had the universal one on my car for the cat for a couple years now with no problem.
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Old 04-16-2011, 08:01 AM
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Originally Posted by Swampdonkey View Post
I've had the universal one on my car for the cat for a couple years now with no problem.
That's the second one right? I put it in the first one. I don't think this universal one is a wideband which is what the front one needs to be... the real one is comming in today so i will swap it out and we'll see...fingers crossed.....
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Old 04-16-2011, 04:52 PM
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So new primary o2 sensor installed and still in limp mode. Got rid of the code except for the p0037 which is the secondary o2 sensor because of no cat. So still in limp mode. No cel to reference to but now i am burning lots of oil. The inside of the tail pipes are covered in burnt oil. Along with tons of smoke. Any ideas??
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Old 04-16-2011, 07:45 PM
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blown seal. My guess is one of your side seals or oil seals has blown and now your dumping oil into the combustion cycle.
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Old 04-17-2011, 12:41 AM
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You would be better to run it without a WB02 sensor,,,


The stock sensor measures current difference and a normal O2 measures voltage differential.....your ECU is likely freaking out
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Old 03-08-2019, 02:47 PM
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Limp mode

Wow ok I'm completely new to this and having same issue but learned some very good stuff that I hope solves my issue . I had no clue there were different types of Limp mode with that being said I am now looking back at mop because I know it has been monkeyed with and it does exactly as I read in this thread. I start it no problem runs good has high r's for a few seconds then goes right into limp mode however I can still drive it if I'm on a straight no hills it will make it slowly up to around fifty but gowing upthe smallest of hills back down to about 20 or down a hill up to even 80 ! I'm going to try to adjust mop switch if anyone has some advice it would be much appreciated thanks fave
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Old 03-08-2019, 03:28 PM
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Also it will rev up to almost 8 grand in neutral thanks Dave
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Old 03-08-2019, 11:41 PM
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The limp mode is load based.... so you will find it free revs fine

Try adjusting the switch a bit... may need to try both directions a bit until it works

If that doesn't work let us know....
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Old 03-10-2019, 05:54 AM
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Hi there,
The P0134 code will activate the limp mode as it will be making sure that a safe fuel mixture for the operator to get to safe destination. The sensor after the Catalytic converter is the usual culprit due to where it is fitted as it is easy to damage with road debris and diving style. Iíve killed mine twice, so have had the panic of have I killed the engine.

If you are running without 2nd sensor you might want to reset the fuel trims, so the car will re-learn fuel set-up. This might help with letting the ECU to think that sensor is not required. This sometimes works, but this car is difficult to figure out as they all seem to do their own thing.
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Old 03-10-2019, 01:14 PM
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Most common true limp mode in an RX8 is OMP issues. Followed by DBW throttle issues. The DBW throttle issue will throw codes.... the usual OMP failure will not throw a code..

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Old 03-10-2019, 02:17 PM
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I was thinking that there might be an issue with the omp with the excess oil at the exhaust tips, but I'm sure if the omp fails it switches to minimum values. Could the omp jam on full then cause the sensors to get confused? that should show a different code .
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Old 03-10-2019, 06:24 PM
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Originally Posted by RobinPZ View Post
I was thinking that there might be an issue with the omp with the excess oil at the exhaust tips, but I'm sure if the omp fails it switches to minimum values. Could the omp jam on full then cause the sensors to get confused? that should show a different code .
Usually the black exhaust tips are from rich AFR that the car runs... the only time I've seen the pipes a nice light color are after a track day... it cleans them up nice 🙂

Usually the OMP issue is the setting of the position switch. it seems to get out of alignment... and then it doesn't like it and goes into limp mode.
Failures of the stepper motor tend to throw codes... for whatever reason there isn't one for the position switch.
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