Help

have a 01 grand prix and getting code po131have changed plugs and wires. the car will not idle, when i disconnected the mass car idled at 3k. changed the mass and car still will not idle help please car has 3.8 motor

P0131 = O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

I would have a look at the Pre-cat 02 sensor thats mounted in your rear exhaust manifold. If it checks out, I myself would probably just replace the sensor. They do go bad from time to time and after years and milage tend to get "lazy" where the switching time becomes longer and longer. If you do replace it, you may need to rent or borrow an O2 sensor socket, and sometimes removing it with the exhaust manifold hot makes it come out a little easier. Make sure you stick with a stock delco brand.

Welcome to AF.

Will it idle when you disconnect the pre CAT 02 sensor electrical connector? The 02 sensor is really not used at initial cold engine startup and until the engine has warmed up sufficiently and ready to go into closed loop mode from open loop mode.

On brand of 02 sensor the Denso brand works fine too.

I knew there was another brand that was good to go Bob. I just couldnt remember for the life of me what it was... delco, denco, bosch.... so I didnt mention anything.

Thanks for clarifying.... denso.

I knew there was another brand that was good to go Bob. I just couldnt remember for the life of me what it was... delco, denco, bosch


Oh Oh Tim. :uhoh: You said the "B" word. Watch out for Rich. Hide!


:rofl:

He gets 10 demerit points.:naughty::evillol:

10 more? really? Ah Man! I dont have many to lose! I'm down to about 30 left.

Did someone say the "B" word, :swear: :nono:

You're lucky I like you Tim, or I'd :nutkick:

OOPS! Sorry Rich, I wont let it happen again!