Skip the auto shop - Our mechanics make house calls

Q: Get code P0354 #4 cylinder

asked by on

I get code P0354 #4 cylinder after driving 30 to 45 minutes.

A: That code is for the ignition coil circuit....

That code is for the ignition coil circuit. There are 8 coils, one for each cylinder. Temperature can affect the performance of a coil, which can function normally when the engine first starts, but malfunction when it gets hot. The coil will need to be tested, but most likely it will need to be replaced. This would also be a good time to check the spark plugs, if they have not been serviced lately. I recommend having a top-rated mechanic, such as one from YourMechanic, come out to the location of your XJ8 to run a diagnostic inspection, and replace your ignition coils, if necessary.

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!

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 is the estimated time that a repair for leaking gaskets to last. Also, for replacement of gasket covers?

Hi there: In order to answer your question correctly, we need to know which gasket you're referring. If you're speaking about the valve cover gasket replacement, when done correctly, a valve cover gasket should last more than 100,000 miles without...

Q: Vehicle is in limp mode. How can i reset it?

Unfortunately, Jaguar is pretty particular about keeping the procedures for clearing codes in house. You'll have to contact a Jaguar dealership or authorized repair facility to have them assist you here.

Q: Security system is activated and now the car only goes up to 50 mph - 2002 Jaguar Vanden Plas

This suggests that the car has gone into a fail safe mode. This is a safety mode that the car will go into when the computer has detected that a critical component has failed or is not working properly. This...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...