Limp mode is a reduced-power strategy that can limit engine power, RPM, or shifting after a control module detects a fault. Get to a safe place if the car is overheating, has an oil-pressure warning, ...

A faulty engine coolant temperature sensor can give the engine computer an incorrect temperature reading. Depending on the vehicle, this may cause hard starting, rich running, poor fuel economy, or ...

P0420 means the ECM has detected catalyst efficiency below its threshold on Bank 1. A worn catalytic converter is common, but an exhaust leak, sensor fault, or engine problem can trigger it too. Check ...

A bad or clogged fuel injector can cause a cylinder misfire, rough idle, hard starting, poor fuel economy, or a fuel smell. Ignition, compression, wiring, and fuel-pressure problems can cause similar ...

A bad ABS sensor can turn on the ABS warning light and may also trigger traction control or stability control warnings. A sensor or related wheel-speed signal problem can sometimes cause the ABS to ...

A fuel induction service may help when deposits are confirmed, but the name can cover different procedures. Ask what the shop will clean and why. Rough idle or poor fuel economy alone does not prove ...

P0340 means the engine computer is not receiving a usable signal from the camshaft position sensor circuit. The sensor may have failed, but wiring, connector, timing, or crankshaft-signal problems can ...

An oil-pressure warning that flickers at a stop can be confusing, especially if the engine still sounds normal. That pattern may offer a clue, but it does not tell you whether the cause is a low oil ...

Unleaded 88 is gasoline with up to 15% ethanol. Many newer gasoline vehicles can use it, but check the fuel door or owner’s manual for E15 approval. Do not use it in a vehicle or engine that is not ...

P0496 means the EVAP system detected fuel vapor flowing when purge was not expected. A purge valve stuck open is one possible cause, but the code does not prove the valve is bad. Check related codes ...

A failed glow plug can cause hard cold starts, rough running after startup, white smoke, or a glow-plug warning. The relay, wiring, battery, or fuel system can cause similar symptoms. Scan the vehicle ...

P0507 means the engine is idling faster than the computer’s target. A vacuum leak, throttle-body issue, disconnected hose, or incomplete idle relearn can cause it. Check for recent work and intake ...