Skip the auto shop - Our mechanics make house calls

Q: After engine replacement, Service Engine light on

asked by on

Unfortunately, I had to have my car’s engine replaced. When I picked up my car, the service engine light was on, so I returned to the auto repair shop and they replaced the oxygen sensor. For a couple of days the light went off, but now it is on again and won’t go off. What needs to be done to fix this warning light problem?

A: The malfunction indicator lamp illuminates ...

The malfunction indicator lamp illuminates at the sign of an error in a number of the vehicles systems. The trouble code must be read every time to see if the same or a new code has popped up, then the technician can follow through with the diagnosis. The issue may or may not be related to the engine swap. It is possible that you have a faulty control units, but this is uncommon. If you would like to have this scoped out, a certified pro from YourMechanic can come to your car's location to thoroughly diagnose the Check Engine Light and have this addressed appropriately.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How do I stop the engine in another gear other than Park?

While you generally put the gear into park before turning off the engine, there may be times when you will stop it in neutral. Put the parking brake on. Move the shifter to P. Look for the indicator light...

Q: Right turn signal blinks faster than left; 'Oil light' stays on

Hello. If the low oil light continually comes on then it is a bad sensor, assuming that the oil level is fine. This is located in the oil pan. The sensor will most likely need to be replaced. As...

Q: Changed 02 sensor still code keeps coming back an truck running sluggish

A code to an O2 sensor can mean the sensor is having a problem or the sensor is telling you that there is a problem with the fuel control system. Depending on the code received your engine is either running...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.