Misfire cylinder 2 & 6, check engine light, replaced coils and sparkplugs.

[porsche]

I have a 2015 Porsche Cayenne S E-hybrid with a check engine light, where the main error codes has been misfire cylinder 2 and 6 that did not resolve after changing coils and spark plugs.

The car i running fine. Everything is working as normal, there is only the yellow "check engine" light.

 

I should mention that the first time the car was at the Porsche workshop because of the check engine light, the error code was: Electric motor, rotor position sensor - short circuit to B+. 

 

Porsche cleared that, but on the way back from the workshop the check engine light came back on. This time the error code was: P33CB00 - High-voltage power electronics control unit - function restriction.

 

Once again they cleared the codes but the check engine light came back on shortly after. This time they read out "misfire detected on all 6 cylinders".

 

They once again cleared it, but the check engine came back on. This time the error codes was "misfire cylinder 2 and 6". They changed the coils but it came back and the error codes was "misfire cylinder 2 and 6". Then they changed the sparkplugs.

 

After the sparkplugs was changed I was able to drive the car for 1,5 hour before the check engine came back on. This time Porsche also read the error codes "misfire cylinder 2 and 6"

 

Now they are not sure what is causing it. The car feels and drives exactly like normal. The only problem is the "check engine" light. It has about 80 000 miles on it and is made for the US-marked.

 

I would really appreciate if anybody has any good ideas what could be wrong or what to do next.

[Loren]

Please give us the exact engine misfire error codes. Thanks.

[porsche]

Here are the error codes from when it was all 6 cylinders:

 

P030000 - Misfire detected

P030100 - Cylider 1 misfire detected

P030400 - Cylinder 4 misfire detected

P030300 - Cylinder 3 misfire detected

P030600 - Cylinder 6 misfire detected

P030200 - Cylinder 2 misfire detected

P030500 - Cylinder 5 misfire detected

 

Those were the first time they read cylinder misfire. The last 3 times Porsche have read the error codes it was only cylinder 2 and 6.

[porsche]

This took a long time to find out, but after several times at the Porsche workshop without them being able to find the error, I handed it to an independent workshop. They found the problem after one day. It was a cable to the aircondition unit that was broken and gave the check engine light. This is repaired and the check engine light has not returned.