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Yesterday I had my 99 C2 for service at my independent shop and the following codes are coming up PO304, P0306, P1125, with CEL on. We changed the boil, filter, air filter, clean the MAF, new fuel filter, Beru spark plugs and check all the ignition wires, the codes still showed up, but the CEL has not come up yet. The car is max out lean 25.5, can anyone direct me to a solution or should I go to the dealer.

Thanks

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P0304 Misfire, Cylinder 4, Damaging to Catalytic Converter

P0306 Misfire, Cylinder 6, Damaging to Catalytic Converter

P1125 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

If the CEL is flashing it should not be driven.

I would start by looking for cracked coil packs on cylinders 4 and 6.

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P0304 Misfire, Cylinder 4, Damaging to Catalytic Converter

P0306 Misfire, Cylinder 6, Damaging to Catalytic Converter

P1125 Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Lean Threshold

If the CEL is flashing it should not be driven.

I would start by looking for cracked coil packs on cylinders 4 and 6.

Thanks Loren, I will look on them and see if any of them are bad, Could it be the plugs, I bought them from pelican parts products BERU 996-559-237-09-70C-m100 .

Could it be the MAF or any other part in your opinion>

Thanks for your help.

Cesar

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A bad MAF would not usually cause misfires on only two cylinders.

You may have another problem with the P1125 but I would fix the misfires first - clear the codes and see if it comes back.

The correct Porsche part number for your MY car's spark plugs is:

996.170.207.91

They should be: 14FGR 6KQU

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A bad MAF would not usually cause misfires on only two cylinders.

You may have another problem with the P1125 but I would fix the misfires first - clear the codes and see if it comes back.

The correct Porsche part number for your MY car's spark plugs is:

996.170.207.91

They should be: 14FGR 6KQU

Loren, took the car to the dealer for a new remote programming, $120.00, at least they perform a diagnostic in the car, they said the oil bellows need replacement, $600.00 plus they added another $635.00 for a new MAF which I know I dont need and another $456.00 for bolts, hose oil leak etc.

I know the oil leak may be the problem, I check plugs, wires, and seems no problems there, I will let you know.

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