Peña's Auto Electric in south Bakersfield diagnoses check engine lights by reading the codes, testing the system behind them and explaining the repair before work starts. A lit check engine light fails a California smog check. Call (661) 599-9098.
What the light means
The check engine light, also called the malfunction indicator lamp, turns on when the onboard computer detects a fault in the engine, emissions or transmission systems that it cannot correct. The fault is stored as a code. A steady light means a fault was detected. A flashing light usually means an active misfire that can damage the catalytic converter, so reduce speed and have the car checked soon.
Why a code is not a diagnosis
A code such as P0420 says the catalytic converter system efficiency is below threshold. It does not say the converter is bad. Exhaust leaks, failing oxygen sensors and engine misfires can set the same code. A scan tool shows the code. A technician finds the cause by testing sensors, looking at live data and checking wiring. That is the difference between a quick fix and a repeat visit.
The smog connection
In California, a lit check engine light fails the smog inspection. That makes the light a smog problem as well as an engine problem. If your registration is due, diagnose the light before you test. We handle both under one roof: diagnosis, repair, and the smog check afterward when the car is ready.
What we check
We pull stored and pending codes, check freeze frame data, inspect vacuum hoses, the gas cap, ignition parts and wiring, and test sensors against specification. Many lights come from simple causes such as a loose gas cap or a failed sensor. We start with the likely causes and move on only when needed.
What to tell us
Note when the light came on, whether the car runs differently, any recent repairs or fill-ups, and whether the light stays on or flashes. Do not clear the codes before you visit. Clearing codes erases useful data and resets the emissions monitors.