Posted: Tue Dec 24, 2013 10:40 pm Post subject: Lazy temp sensor
I think I have a lazy temp sensor or a sensor that has taken a "set" Basically the car will only get up to 185 degrees on a 195 degree t-stat. The t-stat is new, I verified the temperature with my scanner to rule out a lazy stepper motor. There are no coolant leaks and I replaced the radiator cap because I found a bunch of brown crap on it, suggesting it was leaking at one point in time. My gas mileage has gone down and I have been chasing the engine hunting at idle while in gear. It has been cold here like down in the 20's and 30's, but it wouldn't get up to temp on a 47 degree day. Also while in traffic the temp would fall roughly 20 degrees when accelerating.
rear O2 doesnt read A/F, just air flow. The front O2 does all the important stuff.
efficiency, not flow
"A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
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