Quote:
Originally Posted by WrenchTech
I got one of those wifi dongles that you plug in to the OBD port. It tells me that my runner's got PO125 and PO171 codes, along with the message that my coolant is not warm enough to put the engine management into closed loop mode. It also says that my coolant is at 194˚F, which I believe is correct. And it said that my intake air was 75˚F when the outside temp was about 27˚F. Is that MAF problem or just under-hood air temp? I just did a fuel mileage test and I found that I'm getting 10 mpg in mixed driving. I know that I was told to check the PVC valve and look for vacuum leaks. I didn't do it yet but I'm headed out to the driveway to do that right now. When I looked at the O2 sensors I noticed that the front sensor looks like its been on there for a long time, so long that the nuts that secure it are almost rusted away. Luckily the flange and the studs look ok. The vehicle has 295k miles on the odometer. -- Matt
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I’d replace the front O2 sensor.
Look to see if you are in closed loop.
I’d think about clearing codes and see what comes back after replacing the old as dirt front O2 sensor.
To check the temp sensors let it sit overnight and turn in ignition without starting and check the ECT and inlet air temp. They should be within 10 degrees of each other and within 10 degrees of ambient temp.
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