My check engine light is on

[tw]

Originally Posted by Undertoad

The Cellar Car's check engine light is on. For a few days the engine was running poorly, like one of the cylinders didn't have full power. Maybe a fuel injector is clogged.

Without the engine code numbers, any answer would be wild speculation.

Some cars require a OBD reader. Others will flash the error code on the dash when a jumper wire to attached to a plug underneath the dash. Montgomery County library often has books for each car model that would describe how to get the "DTC" code.

Without that code, I could think of at least 12 different items that would explain that behavior. The actual list is far longer. First get the DTC number.