yourchemicalbrother

I have a 1996 F150 with a 300 I6 EFI. Recently my check engine light came on. My hand held code reader gave me three different fault codes that follow:
P0155, P0141, and P0420.

I think the P0155 and P0141 are O2 sensor faults for two different O2 sensors, but I don't know which ones or where exactly their located.

Can anyone tell me exactly what these codes mean and any possible means to fix them.


Thanks for the help

aliens8mycow

You're right - 141 and 155 are O2 sensor circuit failure (wiring issues?)

420 is the bank 1 catalytic converter - efficiency below threshold (plugged up?)