Skip the auto shop - Our mechanics make house calls

Q: My Check Engine Light is on and will not turn off

asked by on

Check engine light is on. I installed a cold air intake a few years ago. Some time later my check engine light would go on and then turn off after a while. Now it is always on. I noticed some engine oil contamination aparently being vacuumed through the PCV line connecting to the cold air intake and going into the throttle body. Is it possible this might have set the check engine light on? Would an Oil Catch Can help in solving this issue?

My car has 125000 miles.
My car has an automatic transmission.

It is possible that the recirculation of the oil back into the intake could be causing an issue, if the amount is excessive. However, without reading any troubleshooting codes, there would be no way to confirm why the Check Engine Light is illuminated; the Check Engine Light can come on for any number of reasons. The first thing that you are going to need to do is use a scanner to pull the codes from your vehicle’s computer and see what they indicate. If you need assistance with this, you can always contact a certified technician, such as one from YourMechanic, to diagnose the reason for your illuminated Check Engine Light.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. My Check Engine Light is on and will not turn off

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

Get a quote

What others are asking

Q: What does the Malfunction Indicator Lamp or Check Engine light mean on?

There are several warning indicator lights on the vehicle dashboard. The purpose of these lights are to alert drivers of an engine or transmission malfunction/error, or that attention to a specific component is necessary. There are numerous other warning...

Q: The ignition button pressed all way through

Hello. Thanks for writing in about your 2010 Jaguar XF. If you think that it needs a new button, then the entire ignition electronic switch needs to be replaced as an assembly. If you are not having any trouble with...

Q: Rear differential temp light on - 2006 Subaru B9 Tribeca

Despite the connector appearing OK, this is an indication of 0 (zero) resistance or a short in this circuit. It's possible the temperature sensor on the differential is itself shorted, or there is a short elsewhere in this circuit. This...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...