Oxygen sensor problems
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,328
Likes: 0
From: Central TX
Oxygen sensor problems
to start, my car is not stock. it has intake, headers, gears, etc...
For about 6 months it has been giving codes for the left and right O2 sensors. I researched and finally decided to swap out the OEMs with some Densos. Cleared all codes, and took her out. No problem for about 25-30 miles, then the codes came back. Now it is the same problem, drive for a few miles and the Check engine light comes on, i check the codes, and they are the sensors again?!
What gives? What else do I need to check? I feel i wasted my $$$ which incorrectly fixed a problem.
For about 6 months it has been giving codes for the left and right O2 sensors. I researched and finally decided to swap out the OEMs with some Densos. Cleared all codes, and took her out. No problem for about 25-30 miles, then the codes came back. Now it is the same problem, drive for a few miles and the Check engine light comes on, i check the codes, and they are the sensors again?!
What gives? What else do I need to check? I feel i wasted my $$$ which incorrectly fixed a problem.
"AlohaC5" Senior Member
Joined: Jun 2003
Posts: 3,562
Likes: 44
From: Madison, AL
What are the codes that appear on the DIC? Did you edit out the rear 02 sensors? You can look the codes up at: http://97vette.com/howto/codes/index.html
Racer
Joined: Jul 2004
Posts: 431
Likes: 0
From: Browns Mills NJ
It takes a certain drive cycle to run the O2 diagnostics. I would venture to say that you probably have aftermarket catalysts, like Random Techs. And I'd also bet that your codes are Bank1 sensor 2 and Bank 2 Sensor 2. Common issue with aftermarket catalysts. Only way to fix them is use O2 sims or get the code turned off by your tuner. You could also put the factory cats back on but you probably would lose a little hp if you did.
Jersey
Jersey
Thread Starter
Melting Slicks
Joined: Jun 2004
Posts: 2,328
Likes: 0
From: Central TX
the exhaust was already on when i purchase the car
yes, there are only the rear sensors
the cats are still stockers- i was planning on some random techs eventually
are simulators plug n play? there is not a programmer within a few hour area where i live, so it would be a road trip for something so mundane
yes, there are only the rear sensors
the cats are still stockers- i was planning on some random techs eventually
are simulators plug n play? there is not a programmer within a few hour area where i live, so it would be a road trip for something so mundane
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
Originally Posted by jfrc
the exhaust was already on when i purchase the car
yes, there are only the rear sensors
the cats are still stockers- i was planning on some random techs eventually
are simulators plug n play? there is not a programmer within a few hour area where i live, so it would be a road trip for something so mundane
yes, there are only the rear sensors
the cats are still stockers- i was planning on some random techs eventually
are simulators plug n play? there is not a programmer within a few hour area where i live, so it would be a road trip for something so mundane
The 2 front sensors work with the PCM to control your AFR and are mandatory, the 2 back sensors let the PCM know the cats are functioning properly.
so when you say:
the exhaust was already on when i purchase the car
yes, there are only the rear sensors
the cats are still stockers
Are you trying to say that you only have 2 sensors installed and they are behind the cats?
Instructor
Joined: Dec 2003
Posts: 128
Likes: 0
From: houston texas
I've got the same problem code P0157, I've replaced both rear sensors, checked fuses, no vacuum or exhaust leaks. I have Random Tech cats and long tubes. I was wondering if O2 sims would cure this problem and are they pluig and play or do I need to go get re-tuned. Damn frustrating when you spend the money for O2's and it doesn't correct the problem. I can clear the code but it just comes back after about 10-15 miles of driving. Thanks guys for any help you can provide. BTW, I've had the LT's on for about 5000 miles with no problems.
Heel & Toe
Joined: Apr 2005
Posts: 17
Likes: 0
ok both cars are having the same problem, your rear O2's are pissing bcuz of your cats or lack there of. you have 4 O2's (which you know by now). the 2 forward O2's are important since they control a/f mix at idle & cruise. the 2 rear O2's are mostly just there to check emissions and sort of double check the forward O2's (in a way). as for car #2 the performance cats are the problem, car #1 my guess is when whoever installed the headers they also guted the stock cats= problem. O2 sim's will fix both cars only cost about $100 bucks and are easy to install. i have been running sim's on mine for 3 years with no trouble at all.
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Instructor
Joined: Dec 2003
Posts: 128
Likes: 0
From: houston texas
Mac,
Thanks, I appreciate your response, I'm switching over to O2 sims.
O2 sims are ordered and on the way. Thanks again
Thanks, I appreciate your response, I'm switching over to O2 sims.
O2 sims are ordered and on the way. Thanks again
Last edited by busavette; Apr 5, 2005 at 07:22 PM. Reason: adding more info