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Check Engine light came on today with 4 codes.

J

johnnyb

New member
My Fiance was driving home from work today when her check engine light came on. She took the car to auto zone and they pulled 4 codes from the car with 2 of them being the same code
p0137 twice
p0140
p0141
All of these say Heated oxygen sensor bank 1 sensor 2. So what do I need to fix and are the codes a big deal? Will her performance suffer? Thanks.
 


Looks like the rear one, just jack up the car so you can get under it, the o2 sensor is in the ubend of the exhaust just before the resonator, get a 7/8" wrench if you dont have an o2 socket and wrench the old ****er out. Make sure you unhook it first though lol.
 
Yeah autozone would be a good place if you want to get it locally, if you don't mind waiting I would check RockAuto Auto Parts but don't cheep out on the O2 sensor, I would try and get a Bosche or something. Rockauto has the same Bosche O2 sensor for ~$20 cheaper than Autozone.
 


Yeah it has a code for different things with the o2 sensor and if the sensor goes bad all the codes will pop up.
 
I am having a similar prolem with my 01 GTP. I swapped out my PCM for a reprogrammed PCM from 3800 performance two days ago. After driving it for about two minutes, the SES light came on. So, I took it to the dealer the next day to get the CASE learn done (was told that should clear the SES light. Two minutes after I leave there, the SES Light comes back on. So I took it to Autozone and got it scanned...came up wit a P0171 (aaFuel trim bak one condition) code, and a P0137 (aaH02S12 circuit condition (heated oxygen sensor bank aa1 sensor 2) code. Disconnected the battery for ten minutes, reconnected, the light was out. Was driving this morning for ten minutes, then the light came back on. Went back to Autozone, had the P0171 code again (and maybe the P0137 code too, but he said there was two 171 codes, and cleared them for me before I could confirm if the second code was in fact the 137 code). Drove for five minutes, then the SES light came back on. One thing I must mention is that I have no CAT on the car (didn't have one with the old PCM, but buddy of mine may have tweeked the last PCM when he put in down pipe with no CAT). Could the problem be my O2 sensor(s), or no CAT and reprogrammed PCM picking that up? Please help!
 
you may just have to get the code tuned out of the pcm for the 02 sensor, but if your getting a heater ciruit code then that means the 02 sensor itself is bad,,have you tried hooking the other pcm up and seeing if the codes come back
 


I can't hook the other one back up because I already sent it back. Sorry about multiple threads, but I replied to a couple before I actually figured out how to create a new one.
 
do you know if the codes are suppost to be out of that pcm, if your not running a cat then you souldnt be getting anything for the rear 02 sensor when the pcm is tuned for it
 
it would be a good idea to get it tuned for a no cat, are one of the codes p0420?...cause thats for the cat itself..do you even have a rear 02 hooked up?..cause if not that could be causing the heater ciruit code..you could run a dummy 02 making everything is working fine...i think there like 30-50 bucks or so
 
Had the car jacked up by a exhaust shop yesterday. Has an rear O2 sensor tucked away (cut no CAT). Throwing codes P0171, P0137 and P1133. Old PCM definitely had O2 codes removed when they installed the downpipe and removed the CAT (same time). Ordered a rear O2 Emulator yesterday (is that what you mean by dummy O2?).
 


Sorry, meant 'but' no CAT. All of these codes didn't come up until I replaced my old reprogrammed PCM for the current reprogrammed one from 3800 Performance. Says the O2 Emulator will eliminate the SES code associated with removing or unplugging your post-cat (rear) O2 sensor...and it plugs directly in to the stock harness. Hope this works. Thanks guys.
 
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