Hello everyone I've been having an issue with the CEL flashing My cheap reader shows me P0 300 P0 304 305 306 I have replaced all coils spark plugs new injectors and all new solenoid on bank2 Took it to the Porsche dealership or they could not find any issues with the car Any thoughts would be greatly appreciated

 

Flashing CEL much more serious than steady - following is what the manual says. Surprised dealer let you drive off with a flashing CEL.

If the check engine warning light in the instrument
panel is flashing, serious catalytic
converter damage and power loss will soon
occur.
Prolonged driving with the check engine warning
light on could cause damage to the
emission control system. It also could affect
fuel economy and driveability.

f Have the fault remedied at the nearest
authorized Porsche dealer immediately.

 

Thanks for your response. The car is still at Porsche thy want to keep the car for a few days to see if CEL will come back on. It takes about 3-4 times to Flash for about 4-6 sec each time before it stays on.
can a bad catalytic converter cause the whole bank 4,5,6 to Misfire? When the light flashes no symptoms or power loss with the car. When I took the car in my cheap OBD reader had codes p0300 p0304 p0305 p0306, after thy did a Diagnostic and running test they can't find anything wrong with it. I dont have much info about the car all I know it was sitting in the garage for 3 years I was hoping after everything was changed out on bank 2 it would work but we're still having multiple misfire

 

if anyone would like to contact me 210-236 2744 Thank you

 

Replace the Variable Timing Solenoid.
99710530100

 

They need to focus on items that are specific only to Bank 2, such as:

1. Intake leak at the plenum or intake manifold on that side (might get a rich or lean CEL with this one too as well as the misfires)
2. failed catalytic converter on that side (unlikely or you'd get O2 sensor errors too)
3. Bank 2 Camshaft Position Sensor (this is most likely the culprit - just changed mine on Bank 2 last month for the same reason)
4. Variocam Plus Sensor for Bank 2 - also a possibility. If the CPS sensor on Bank 2 is reporting data, look here next.

They can easily check if the Cam Position Sensor is bad, by tracking live values with Durametric or their PIWIS computer and looking at Camshaft Deviation for Bank 1 and Bank 2. I bet Bank 2 shows all 0s like mine did, which means the sensor is no longer picking up the camshaft revolutions and reporting the position to the DME, which controls spark timing and why you're getting misfires.

See how Bank 1 is reporting but Bank 2 is not...



BTW, the flashing CEL is only a major issue if it stays flashing, not if it flashes at first and then becomes solid. These are also usually yellow warning messages - if you ever get a red one, that's a different story.

 

Hello everyone my car has been at a Porsche Dealership for 4 1/2 months and after $3919 its still not fixed according to them the car runs fine with no Symptoms of a Multi misfire on Bank 2. When the CEL flashes few times it stays on there is no shacking or power loss at the time of CEL Flashing All solenoids and Sensors have been replaced also DME has been replaced. Flywheel was inspected too but check out good .Basically Porsche is running out of options and I'm running out of patience. If Porsche cant FIX IT who CAN????? Has anyone ever had this happen any help is appreciated

 

Have they done a compression or leak down test on Bank 2. I'd start there. If you have a compression problem (stuck rings, scored bore, etc) then compression will be low and that will cause a misfire. If the compression is good, then we can start looking at sensors (O2 sensors, intake manifold or plenum vacuum leaks, variocam sensors, variocam solenoids, etc).

 

Yes compression and leak down was done variocam sensor and solenoids have ben replaced

 

Smoke test the intake and look for a leak at the Bank 2 intake manifold or on that side of the intake plenum. Is the plenum an OEM unit or has it been replaced with an ipd or something. If stock, they're plastic and can crack. If replaced, they may not have gotten the hoses and clamps on well on that side. Unmetered air entering through a vacuum leak can cause this type of behavior.

 

Thanks for you quick response. Yes plenum is a OEM If the plenum has a leak wouldn't it cause problems on bank 1 ? Few months back they mentioned they did 2 Smoke test and couldn't find anything

 

 

Has Porsche checked for rodent damage i.e.: wiring, hoses, anything plastic, etc...? It happens.

 

about 6 fill ups and replaced Injectors

 

Probably not my! In the last 4 months Porsche hasn't been very help full every time I call they give me the runaround and don't have any answers
All they say is we are working on it.