Intermittent CEL and Codes

[shoon]

Car runs fine, fuel economy is good! I randomly get a CEL when putting load on the engine (just after flooring it to pass some cars, usually while flooring it, or on the de-cel it pops on for a few seconds then goes off)

Pulled codes using KOEO and came up with this:

114 IAT sensor out of range - IAT
116 Engine Coolant (ECT) sensor out of range - ECT

176 Oxygen sensor not switching - system is or was lean Left or Front HO22SSS - Fuel control

177 Oxygen sensor not switching - system was rich Left or Front HO2S - Fuel control

528 (M) System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch) - PNP


Temperature drops to below -40's so that might explain my 114, and 116 codes (although they are original sensor so I'm probably just going to replace them anyway) Not sure if those sensors actually wear out or not though.



O2's were replaced 3 years ago with Motorcrafts; but don't have a whole lot of mileage on them, 50,000km or so. I guess they are worn out.





Not sure about the 528 code though, have had that since I bought the car.


Replace everything or just O2's?

Thoughts?

 

[SHOYAY]

Sounds almost just like the problem I just had with my taurus slo. Went thru **** trying to find the problem. Ended up being an O2 sensor was shorting out.

 

[silver93sho]

definitely could be the o2 sensor, i had all those same codes, minus the 528, plus a few others. figured out all those are on the same ground. the worst one too, under the fuel rail bolted to the block....cleaned it and those went away, haven't had any of those codes since then. but that is what fixed my issues, not sure if that is your issue, just what i went through.