My car has code P0357?

Tiny
PETPARENT
  • MEMBER
  • 2004 MERCURY GRAND MARQUIS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 246,509 MILES
My car has code P0357. I repaired it before by putting a new spark plug and a new spark plug insert into the cylinder head. It continues to give me the code even after removing the old plug and replacing it. I also removed a piece of rubber from the spark plug chamber. I thought that would solve my problem. Service Manuel said it was a circuit malfunction to check the circuit.
Monday, December 23rd, 2024 AT 7:48 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
It is common for the ignition coils to go out on these engines, I would replace the coil with a new unit.

A P0357 code indicates an issue with the Ignition Coil "G" Primary/Secondary Circuit.

This video will show you how:

https://www.youtube.com/watch?v=e68QXyBAiZo

Happy holidays!
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Monday, December 23rd, 2024 AT 1:37 PM
Tiny
PETPARENT
  • MEMBER
  • 12 POSTS
Should I check the circuit from the wiring harness for the engine and possibly look for short circuits or other problems in the ignition coil connector?
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Wednesday, December 25th, 2024 AT 12:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
Yes, you can inspect the wiring and connector but most of the time it will be the ignition coil.
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Thursday, December 26th, 2024 AT 11:30 AM
Tiny
PETPARENT
  • MEMBER
  • 12 POSTS
Yes I will inspect the wiring and check it out with my test light and multimeter. Coil was last change and check almost 2 years ago.
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Monday, December 30th, 2024 AT 8:29 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
Okay, also make sure the spark plug is not cracked, this may cause the issue as well.
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Monday, December 30th, 2024 AT 9:32 AM

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