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In terms of possible root causes for failure, the following scenarios are likely culprits for a cooling system to run too cool: A temperature sensor that's reporting lower-than-actual temperatures due to issues like drift/fouling/calibration. A sticking thermostat that is flowing more coolant than necessary to maintain 176 °F. Really cold ambient air ...


Typically, these emissions/inspections tests connect to the on-board computer, and that computer will tell you if a code has been cleared. For example, with the O2 code, I think most cars require you to drive 50 miles before the computer will give the "all clear" after the code has been cleared. If you had 3 O2 sensors replaced, then my guess is that your ...

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