I just recently put a new timing chain kit in my F150 and now I am getting 3 codes that are keeping me from passing emissions test.please help if you have any suggestion also there is a wire on the same harness going to the power steering pump that i dont think plugs to anything i have the one on the pump but the other one is about 6in long and i cant find where it plugs too or if its just a diagnostic connector below are my codes P0156 o2 sensor malfunction (bank 1 Sensor 2) p0136 o2 sensor malfunction (bank 1 sensor 2) p1131 manufacturer specific code Thanks in advance for any help you can give ! by the way its a 2000 f150 4.6 romeo

 

P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)

http://www.obd-codes.com/p0136

P0156 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)

http://www.obd-codes.com/p0156

P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1

Bank 1 is passenger side, bank 2 is driver's side, sensor 1 is upstream (before the cats), sensor 2 is downstream (after the cats).

 

Sounds like a bad O2 sensor. Sensor 2 is the behind the cat one, and bank 1 is the side that has the #1 cylinder. Check to see if it is plugged in good, no burnt wires, and connector doesn't have garbage inside. Before you buy a new O2, of course.

 

Those 3 codes are for 3 different sensors. I doubt that all 3 sensors just failed, it almost has to be a wiring issue.

 

i found a break in the pvc elbow and the breather hose wasnt attached i must have forgotten to tighten it when i was putting it back together ive fixed these and im gonna see what it does now

 

thanks guys