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p0420 fault code.
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gazza82

Posted: Mon Oct 17, 2011 4:59 am

Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks

Update on our P0420 issue ....

P0420 was a constant issue with the 206CC .... until recently.

The coil pack started to fail but not permanantly ... it would miss, then pick up again ... I've now replaced the coilpack with 2nd hand one and since then NO P0420 faults.

I'm thinking that the problems we had earlier weren't a cat or lambda problem but an indication that the coil pack was on its way out. It could have been missing intermittently and allowing unburnt fuel into the exhaust, which would throw the lambda. It must have been slight as we didn't notice the mis-fire on any runs until it really started to go. Then the power was right down and it sounded like it was running on 2 cylinders .. which it probably was.


	Down to just the 1.4 HDi. Cayman Green 2.0i CC sold.

dumdum0910

Posted: Mon Oct 17, 2011 10:46 am

Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth

i dont get a miss. it just comes up out of the blue. i reset the ecu today and will get back to you in roughly 3 weeks if it comes back


	if it dont scuff the ruff it aint low enuf

dumdum0910

Posted: Mon Nov 07, 2011 2:45 pm

Joined: Apr 09, 2011
Posts: 445
Trade Rating: +1
Location: letchworth

the light came back tonight. didnt skip a beat when it popped up was driving normally down the motorway, i now no it was nothing to do with the panel filter or plugs.


	if it dont scuff the ruff it aint low enuf

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