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P0351-P0354 Error codes with no symptoms


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Atonic
New User

May 7, 2019, 3:29 PM

Post #1 of 6 (658 views)
P0351-P0354 Error codes with no symptoms Sign In

Hi, please excuse my ignorance but I am desperate for advise. My daughter has a 2003 Mazda 2 DY 1.5 litre with about 180000 kms on the clock (newish engine put in several years ago apparently). We are not a mechanic savvy family (most I have done is replace a faulty instrument cluster). Had the car checked by a mechanic after the check engine light came on several months ago and they found a historic issue with P0351 to P0354 error codes, basically saying a malfunction with all 4 ignition coils. They cleared the code but it repeatedly comes on (have cleared it several times). There are no symptoms at all with the car, it starts and drives well, no misfiring or noticable loss of power. Could it be a wiring issue, or what else should I be looking at? It is her first car (she is a learner driver) and finances are tight so hoping to try and do something myself. Thank you in advance, and any suggestions would be greatly appreciated. Cheers, Antonia.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 7, 2019, 3:45 PM

Post #2 of 6 (651 views)
Re: P0351-P0354 Error codes with no symptoms Sign In

No, it does not say there is a problem with all 4 coils. It indicates a problem with 2 coils, #1 and #4.

Yes, it is misfiring. You may not realize it and that is the exact reason they build this diagnostic strategy into the system.

Yes, it's possible it could be a wiring or connection issue but usually it's the coils themselves.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Atonic
New User

May 7, 2019, 4:09 PM

Post #3 of 6 (646 views)
Re: P0351-P0354 Error codes with no symptoms Sign In

Thanks for the quick reply. The mechanics couldn’t find fault with the coils (apart from the error codes - might need to try a new mechanic although they did not charge me). The error codes are for all four, sorry if that wasn’t clear, P0351 to P0354 (P0351, P0352, P0353 and P0354). I thought that with all 4 ignition coils malfunctioning something would be more noticeable with the performance, that is why I was erring toward a possible wiring issue. I might change one coil to start with and see if that clears that code at least. Cheers.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 7, 2019, 4:15 PM

Post #4 of 6 (640 views)
Re: P0351-P0354 Error codes with no symptoms Sign In

It's likely an intermittent problem. It only has to occur a couple times to set the code. Could very well be a loose/dirty/corroded connector in the harness.

If the mechanic knows what he is doing he can look at freeze frame data and determine when they occurred and if all did it at the same time.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Atonic
New User

May 7, 2019, 4:26 PM

Post #5 of 6 (635 views)
Re: P0351-P0354 Error codes with no symptoms Sign In

Thank you Hammer Time, appreciate your help. Will get back to them and ask if they have that data, and go from there. Whilst it doesn’t impact performance at all it stresses my daughter out a little, and having the check engine light always on isn’t ideal as we wouldn’t know if a new issue arises. Cheers.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 7, 2019, 4:42 PM

Post #6 of 6 (620 views)
Re: P0351-P0354 Error codes with no symptoms Sign In

Don't assume it's not effecting it. The computer has detected multiple misfires and the problem could get a lot worse at any time.

That also damages the Catalytic Converter.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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