6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBank 1 Running Rich
Reported or suspected cause
still there
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Discussions that report identifying a cause
1
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Reported cause · Original poster
New Beru ignition coils, NGK BKR6EKUB spark plugs and Bosch MAF were installed and the problem is still there.
Leading evidence: 'still there' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'still there' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace injectors' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
I run exclusively Shell Vpower with PEA in it as part of the additives as I understand, and drive it very regularly with proper warm up and cool downs for at least 40 mins.
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Suggestion
Run a couple of bottles with PEA, such as this one with premium petrol for a month and see if it rectifies it.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
I run exclusively Shell Vpower with PEA in it as part of the additives as I understand, and drive it very regularly with proper warm up and cool downs for at least 40 mins.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T091943Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hey guys, need a little help chasing this problem down on my 996.2 c2. P0301, P0302, P0303 keeps happening at low load and when I haven�t fully gotten the engine to temperature. New Beru ignition coils, NGK BKR6EKUB spark plugs and Bosch MAF were installed and the problem is still there. I�m running DT40 oil if that is at all relevant.
Maybe your injectors are peeing more than needed. Run a couple of bottles with PEA, such as this one with premium petrol for a month and see if it rectifies it. Else replace the injectors
https://www.liqui-moly.com/en/pro-li...dqThpbf6#21281
Moreover on Porsche 996 we like the RKAT values, not stft.... Invest on a PIWIS clone
I run exclusively Shell Vpower with PEA in it as part of the additives as I understand, and drive it very regularly with proper warm up and cool downs for at least 40 mins. Would injectors affect an entire bank? It is very consistently cyl 1, 2, 3 misfires.
I did remove both exhaust manifolds recently and the side of bank 2 was reattached with it missing one bolt due to snapping the head off that bolt. Could that possibly throw this problem or am I going with a false lead?
Will grab a PIWIS asap though especially if they give me live reads.
Your bank 2 fuel trims are really bad too. I know Porschetech3 will say not to base decisions on a 996 using OBD2 fuel trim data, but those values should never, ever be seen.
At first glance it looks like your O2 Sensors are connected to the wrong Bank....
On this engine the fuel strategy is separated like two separate 3 Cyl engines....on your shown trim values you have one bank rich and one bank lean....as if the O2 Sensor is reporting to the "wrong engine" therefore cannot make the correct correction adjustments..( and other data is needed to substantiate)
That said, yes I don't like the Generic OBD II values for Porsche.....lol ... The fuel trims work differently than domestic cars....Get a PIWIS....
If you're unsure buy an external wideband 02 sensor in the tail pipes and see what you're getting. They're less then $90 on Amazon and are a great asset in testing.
This is a source reference. Confirm exact model applicability in the original material.
