[tommy303]

Possible NOOB querry here, please proceed accordingly...

My T-bird, ('97 4.6, 77k miles) went from being normal one day to having the CEL on the next. After taking it to AutoZone to have the codes pulled, I ended up with the following:

P0135 O2 Sensor: Sensor 1 Bank 1
P0141 O2 Sensor: Sensor 2 Bank 1
P0161 O2 Sensor: Sensor 2 Bank 2
P0155 O2 Sensor: Sensor 1 Bank 2

Basically during the span of 1 day the car went from being normal to having all of the O2 sensors going bad. Something doesn't click here...

A buddy of mine, (also with a '97) mentioned that sometimes the CEL will throw bogus codes to signify that a major service is needed, (as in the 75k service). He said that I should just disconnect the battery to clear the codes. That doesn't seem to click either...

Does anyone here know what's going on with my T-bird?

 

[IronChopz]

I don't have 1997 wiring or circuit diagrams, but the 1994 PC/ED manual indicates that if these codes are received in pairs (i.e., P0135 and P0155 are received together, and P0141 and P0161 are received together), then the problem is with a "short to power in the HO2S HTR circuit."

Possible causes are disconnected sensors, a short in the harness, a short in the PCM, O² sensors with out-of-spec resistance.