yea, believe it or not this is my first CEL....

P0131

and

P1128

please help

 

P0131 O2 Sensor Circuit - Voltage Low (Bank 1 Sensor 1) B
P1128 Long Term Fuel Trim - System too Lean (Bank 1) B

Maybe a MAF Sensor

 

Precatalytic oxygen sensor will cause both.

 

thanks guys. i took my car to autozone and the first and only code i had was P0131=low voltage bank 1 sensor 1.
i then messed around with all the o2 connectors to see if there was moisture or a bad connection and they looked good. i disconnected the battery for 30min and the light came right back on no hesitate at all. i then went back to autozone and the scan came up with P0131 and P1128.

2 questions
1. where is bank one sensor one. i know its a pre cat but is that on the driver or passenger side?
2. Low voltage? is that a sign of a bad sensor or just one that isnt connected right?

 

Bank one is passanger side. A bad 02 sensor will cause a low voltage signal. If you have anywhere near 100k miles it would be wise to change both pre cat 02 sensors. As they get lazy so does your car.

 

whoaa first one? I had to check the date on the thread.. thought this might have been an old thread that somebody bumped to the top, but damn your first CEL! Not bad!!

 

thanks guys, i guess its time to go get durty.

 

CEL is gone and the car runs better, thanks for the help guys!