CEL 1998 Corolla

[irbryanxp]

Has 105K on it. 3 codes came up:

1)P0125 -most likely needs a new thermostat, no big deal.

2) P0130
3) P0171

Just wondering if 2, and 3 are related to the MAP sensor? Or is it strictly the oxygen sensor? or both?

Gas milage has not been great. With mixed driving (mostly city) I'm going about 200 miles on a full tank.

Thanks

[landphil]

The P0130 is a O2 sensor circuit malfuntion, so that's most likely the sensor itself - sensor 1 being the upstream, pre-cat, or primary sensor, depending on which terminology you prefer. It's the one before the cat, closest to the engine.

Throw in a new DENSO O2 sensor, replace your thermostat if that's the cause of the P0125, and see what happens on the P0171. I'll bet any amount of your money it won't come back.