Check Engine Light On problems of the 2009 Mercury Mariner

Six problems related to check engine light on have been reported for the 2009 Mercury Mariner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Mercury Mariner based on all problems reported for the 2009 Mariner.

1 Check Engine Light On problem

Failure Date: 02/01/2016

The contact owns a 2009 Mercury Mariner. The contact stated that while at an intersection making a left turn, the power steering failed. The check engine warning light illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 125,000. The VIN was not available.

2 Check Engine Light On problem

Failure Date: 08/11/2014

Check engine light came on while driving 55 mph on the freeway on 8/11/14. No signs of malfunction initially. Later the check engine light went off on 8/13/14. Took Mariner to firestone auto care to diagnose check engine light. They told me it was p0022 - vct solenoids, but the engine was still running fine. They reset the computer and told me the next time the check engine light comes on to take it into a dealership. So the check engine light comes back on by 8/17/14. Started noticing shuttering between 50-60 mph on 8/22/14. Took car into dealership on 8/27/14. Was told that the vct solenoids needed to be replaced at approx. $620 and this car only has 29k miles on it and of course is out of warranty. There is a service bulletin on replacing the vct solenoids but of course no recall has been issued. A recall should be issued and I should receive reimbursement for this repair for something that is obviously a widespread problem with Mariners and escapes from 2009-2011.

3 Check Engine Light On problem

Failure Date: 05/05/2014

While driving the auto just stopped and the check engine light came on and stayed on. I turned the auto off and restarted. It did this three times before I arrived back home. Took it to have a diagnostic test on the engine and code p2111 - throttle actuator stock open was the results. This is the second time this happened. The first time was 2 or 3 months ago but the check engine light did not come one.

4 Check Engine Light On problem

Failure Date: 10/18/2013

Turned the vehicle on, drove to end of street wrench aka check engine light appeared just at the same time I came to a stop vehicle started to shack and idle rough and then rpms stared going out of normal range with out a stable position. And then vehicle died twice while making it back to house where I hooked up my obd2 code reader and stated the it was a p2111 code and stated:"throttle actuator control system stuck open" .

5 Check Engine Light On problem

Failure Date: 10/03/2013

Car went into "limp mode" twice within a 3 mile span while doing approx 50mph on a country road. Both times, stopping and restarting the engine allowed normal operation. 5 days prior, the car also stalled twice. Once while pressing the gas from a complete stop, the other while pressing the gas just before coming to a complete stop (traffic signal went from red to green). This is happening less than 10 days after I had vct solenoids replaced that were causing the check engine light to come on.

6 Check Engine Light On problem

Failure Date: 08/04/2011

I was on a high traffic freeway coming home from a maternity appointment (I was 7months pregnant and it was hot) and going 70mph middle lane. When my car just cut off. I was still moving but my dash was off check engine light came on and I pulled to the side. I could get it started back up but it went off again. I finally got off on a ramp. I had to have my car towed and rent a car. Between the tow rental and work on my car the total was (est 1400). Then a year later it began every now and then stalling or surging while I was driving. It has progressively worsen. Now it has been when I stop or let off the gas it goes dead. Recently went to an auto shop and they hooked it to the computer. It said it was my throttle body. It was cleaned and all was fine for a week. And now it is doing it again. I finally did google throttle body and Mercury Mariner. I found other complaints.


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