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

asked by on November 03, 2016

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.

Check Engine Light is on Inspection $94.99 - $114.99 Get a Quote
Ignition Coil Replacement $132.12 - $587.62 Get a Quote

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.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I fold the side mirrors?
The side mirrors can fold in to decrease the width of your vehicle. You should always fold in the mirrors when parked on a busy street, or when driving through an automatic car wash. To fold the mirrors in, simply...
Window not rolling up.
Hello! A window losing operation can be the result of a failed window regulator and motor assembly. Have a mechanic inspect for electrical faults (https://www.yourmechanic.com/services/electric-problems-inspection) concerning the window first. Are both front headlights and tail lights not turning on? This...
Antitheft system not allowing car to turn over
We must determine whether the fault concerns the vehicle or the lock and key set you carry personally. The vehicle system can have a faulty sensor or module causing your concern or a broken/weak transmitter in the key itself. Have...
Clutch pedal gets stuck
There may be a problem with the clutch pressure plate, the hydraulic clutch master, or slave cylinder binding. The clutch is the most likely problem, and would need to be inspected to be sure. I recommend that you have a...
Slow acceleration and gasping noise -1985 Chevrolet C10
Hello. There are multiple possibilities here. There could be a vacuum leak to the engine (which affects timing, mixture, etc.) all of which kick in when under a load (vs. idling). Also, check ignition timing, especially ignition advance mechanisms, for...
Radiator empty but there is no leak from the radiator.
Hi there. Check the coolant hoses and heater hoses for any leaks. If there are no leaks, then check the core plugs (freeze plugs) on the engine for any leaks or signs of leaks. If there is no visible leak,...
My 1994 nisan maxima was running fine when it was parked 2 yrs ago now its missing I even put new plugs and wires on it still my
If the car has sat parked for 2 years with fuel left in the fuel rail and gas tank, be sure the fuel tank is thoroughly emptied BEFORE you add fresh gas. The injectors are probably plugged with varnish and...
Steering
Without visually inspecting the vehicle, it would be difficult to give you an accurate yes or no answer. The scraping noise can be anything from worn brakes - which would have nothing to do with replacing track rod ends, to...

Related articles

Tips for Taking Care of Your Exhaust System
Your Your car’s exhaust system might not be the first thing you think about when it comes to engine performance or personal safety, but it should be pretty high on that list. Your engine combusts fuel and air in order...
P0006 OBD-II Trouble Code: Fuel Shutoff Valve "A" Control Low
P0006 P0006 code definition The P0006 code is associated with an electrical circuit which connects from your engine computer to your fuel system and is most commonly found on diesel engines. It also may be related to other codes, such...
P0485 OBD-II Trouble Code: Cooling Fan Power/Ground Circuit Malfunction
Cooling Cooling Fan Power/Ground Circuit Malfunction What the P0485 code means The P0485 code indicates that your cooling fan power is malfunctioning in some way. This could mean that your fan is coming on when your engine is off, or...