Q: After engine replacement, Service Engine light on

asked by on August 23, 2016

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?

Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

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.

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・Fair and transparent pricing

What others are asking

Engine waterlogged

There is a possibility that your vehicle's engine took on water, or the electrical system has failed. In the event of a flood, it is a hard decision to make at times, but the vehicle must be shut off immediately....

Could someone tamper with your timing chain and cause it to break?

Hi, thanks for writing in. Although vandalism could happen, but its highly unlikely due to the chain being fairly difficult to get to. The most common causes for the chain to fail is a chain that has stretched over time,...

Car won't start after starting minutes before, battery not dead

Firstly, remove the back seat's bottom. Then listen near the fuel pump access cover when someone cycles the key on and off. You should hear the fuel pump come on. If not then you may have a burned out fuel...

Car shut down and will not start. Warning lights are on - 2006 Toyota Highlander

Hello. From what you describe, it would appear that your vehicle is having some sort of electrical issues. The "Generator Inverter Performance" warning comes on when the computer detects an issue with the vehicle's electrical generator inverter. The generator inverter...

Car won't accelerate past 3000rpm

This issue could be caused by a variety of things. I would suggest by checking to be sure that the idle air control module is working properly. Also, check to be sure that the throttle body is delivering...

Brakes making clunking noise - 1992 Dodge Dynasty

Have the front suspension checked for worn tie rod ends. These joints, when worn, can oscillate slightly back and forth while braking, producing a clunking noise. A similar noise can be made from worn brake caliper guide pins, which allow...

2010 automatic toyota rav4 wont shift to reverse

If your transmission will not get reverse gear then you may have an internal reverse clutch band worn out or the apply solenoid is not coming on and would need to have transmission pressures and codes checked to isolate the...

Car idling and running rough

Hello, the engine is equipped with an electronic valve called an idle air control valve. The idle air control valve lets a metered amount of air into the engine at idle to have a comfortable idle and ensure the engine...

Car turns on, runs about 30 miles, and then starts shaking and turns off - 2007 Toyota Sienna

Hi there. What will help you the most is determining the nature of the failing behavior when the car shuts off. Does it have spark after it shuts off? After it shuts off (immediately after), if you spritz some starter...

Related articles

How Do Sensors Get Dirty or Damaged?
Car sensors measure and relay vital information to the ECU. Some sensors can get dirty from normal use, or fail if the car overheats or has a problem.
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.
10 Biggest Car-Related Headaches and What to Do About Them
You You don’t want to, but if you're a car owner it's inevitable that at some point you will experience car troubles. It's also fairly certain that the machine you rely on will cause you grief when you least expect...