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Nov 4, 2010 | 06:28 AM

dbednarsky

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Multiple Codes

I have a 2003 Expedition EB 5.4L Last weekend I started the truck and was putting it in 4HI when the CEL came on for a P2198, P2196, I cleared the codes and went on with things thinking that it was chilly, I just started it and was already putting the load on it with turning on the 4wd and going up a hill. Well today while on my way to work driving straight with no real load on it the CEL came on with P0304, P2198, P2196, P0133. All 4 O2's are newer 01/10, and the upper 2 have been redone around 06/10. I am thinking there might be something else that is triggering this. Any help is appreciated.

Nov 4, 2010 | 08:36 AM

alloro

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The P0304 code means #4 cylinder is misfiring. A misfiring cylinder will also throw off the O2 readings.

Nov 4, 2010 | 09:08 AM

dbednarsky

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plugs are all new, maybe a coil issue??
what else would trigger a misfire... IAT, MAF/MAP???
BUt thanks alloro - that narrows down to the misfire, which is triggering the O2's so I can rule out O2's.. Now just need to figure out what can cause the misfire... :-(

Nov 4, 2010 | 09:30 AM

alloro

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A new plug can be defective so although it's unlikely the plug, don't necessarily dismiss it. Other than that, I would next suspect the #4 COP, then the injector.

BTW, the #4 unfortunately is the back one on the passenger side...the hardest one to get to.

Nov 4, 2010 | 09:34 AM

dbednarsky

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Thanks, I know that one well.... I am the one who replaced the plugs about 3 months ago...it is not friendly.... I will replace that again though, as that is the least expensive repair, and move forward from there..

Thank you

Nov 4, 2010 | 01:32 PM

alloro

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First you might want to swap the #4 COP with the #1 COP to see if the misfire moves with the COP. If it does, you get to replace the COP on #1 instead of #4 and save yourself some repeated grief.

Nov 23, 2010 | 05:02 AM

dbednarsky

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so 2 weekends ago I replaced all 4 plugs on Bank 1 and the COP for Cyl4 and today I got a cylinder 4 misfire again... any thoughts... Injector?? or another sensor issue?