Q: Ignition coil and Check Engine Light issue - 2008 Mercury Mariner

asked by on

2008 Mercury Mariner. I had all of my sparks plugs replaced in Sept. and one ignition coil was coming up bad on a scan P0351. My mechanic moved the A coil to the B coil spot so that when it did go out that it would be easier to get to to replace. Sadly, he was injured in an accident and is in the hospital paralyzed. I have the new coil. Car is misfiring more. Can you tell me (show me) where the B spot is? I know I can replace it myself - watched enough videos- just don't know which one it is. Yes, I am female - HA! Thank you for any help.

My car has 108000 miles.
My car has an automatic transmission.

Hello, thanks for writing in! There is no such thing as a B location for a coil. You have six coils, that is one per cylinder you have. Without knowing where the bad coil was relocated to it would be hard to know. It will be one of the front three coils since the back three requires the intake manifold to be removed for access to the coils.

The Check Engine Light code P0351 relates to the PCM computer primary injector driver problem and burns out the coil driver for that coil.

The repair may require the replacement of all six coils and the engine control module (PCM). This problem is internal circuits of the PCM get burned out from the excessive coil resistance.

Once these components are replaced the PCM will need to be programmed to work with your key through the anti-thief module. The programming will need to be done by a Ford or Lincoln Mercury dealer.

To avoid any unnecessary repairs, I would highly suggest having a certified technician, such as one from YourMechanic, come diagnose your Check Engine Light firsthand and service your ignition coils as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Ignition coil and Check Engine Light issue - 2008 Mercury Mariner

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: Truck not starting.

Your transfer case may have an internal issue or a shift linkage issue may be the cause. I recommend you have a qualified technician check to see if the transfer case is defective or you have just a linkage issue....

Q: 95 grand Marquis GS

You may have a blower motor with debris that got into it from under dash. It may be paper or other debris that are in the fan blades and will make a rattle slapping noise and can only be cleaned...

Q: What does "Service Stabili Trak mean?"

The fault(s) that have caused the check engine light to illuminate should be investigated and resolved first because occasionally resolving those also removes the cause for the Stabilitrak warning light light. The recommended service is a check engine light diagnostic....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...