Ignition coils:One of the ignition coils can fail, causing the engine to misfire. The Check Engine light may come on with codes P0301-P0304 or P0351-P0354 - the last digit of the trouble code is the number of the cylinder that misfires. 2012 Toyota Corolla (E140) Click photo for lar...
The code P0171 can be caused by a dirty or bad mass airflow sensor or vacuum leaks. The bulletin T-SB-0086-16 explains an issue in the 2014-2016 Corolla where the fuel tank filler neck that is out of position might cause the gas cap not to close properly. As a result, the Check...
A low coolant level can cause overheating of the engine and expensive repairs. If the coolant level looks very low, have the vehicle checked for coolant leaks before it causes problems. The code P0138 is often caused by a bad rear or downstream oxygen sensor. Replacing the rear O2 sensor i...