Check Engine Light Illumination on Mercury Mariner

The check engine light may come on due to failure of the Variable Camshaft Timing (VCT) solenoids. The VCT solenoids will need to be replaced if they are the reason the check engine light came on.

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Average mileage: 62,805 (30,000–182,000)
Engines affected: 2.3L 4 Cylinder, 3.0L V6
3 model years affected: 2007, 2009, 2010
13 people reported this problem
6 people shared problem details
2009 Mercury Mariner- 3.0L V669,000
Same problem as others. Engine light goes on and off several different times and finally stays on. AutoZone told me it was some kind of timing issue. Took to my mechanic and he verified it is this same issue with the cam timing. Repair? Estimate $350.00
2009 Mercury Mariner- 3.0L V648,945
Check engine light came on and engine became sluggish as if there was no power.
2010 Mercury Mariner- 3.0L V6182,000
Tonight my check engine light came on. Nothing seems to be wrong with it. When at idle the RPM's barely and I mwan BARELY fluctuates. The only thing I can say is that it does need an oil change which will be this week. Hopefully that helps the problem. I guess we will see.
2009 Mercury Mariner- 3.0L V633,000
Engine light comes on for a while then goes off for a while.Off and on .Now tire sensor is on,
2007 Mercury Mariner- 3.0L V650,000
Check engine light on and fwd light periodically
2010 Mercury Mariner- 3.0L V635,000
Engine light came on ANC dealership could not figure out why. When I tried to drive it the next day it started and said ok to drive but would not accelerate I tried for a couple minutes then restarted it and was hood to go. Makes me worried.
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