8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHMore woes - cylinder 5 misfire.
Leading reported evidence
Replace by porsche, final bill £240
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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1
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Performed · outcome unconfirmed
I have now had the sensor changed by Porsche, final bill £240.
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Suggestion · Original poster
It's a tiptronic and it drove fine (for 20 miles) and then the temperature failure warning light came on followed a few minutes later by the engine check light.
Leading evidence: 'Replace by porsche, final bill £240' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check light' (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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Suggestion · Original poster
It's a tiptronic and it drove fine (for 20 miles) and then the temperature failure warning light came on followed a few minutes later by the engine check light.
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.
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Suggestion · Original poster
After that, the engine check light has varied from flashing to constant and the temperature failure light has 'rectified' itself temporarily and gone out and the gauge has functioned correctly, before failing again.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check light
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
It's a tiptronic and it drove fine (for 20 miles) and then the temperature failure warning light came on followed a few minutes later by the engine check light.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
After that, the engine check light has varied from flashing to constant and the temperature failure light has 'rectified' itself temporarily and gone out and the gauge has functioned correctly, before failing again.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
An interesting second day of ownership!
After getting home earlier I plugged the car into a fairly basic diagnostic reader I have.
As ever, on the initial scan, it found lots of codes but, I always find that many of these can be historic and not relevant/current so, I recorded them, cleared them and then restarted the car end went through the process again.
On the second diagnostic run it came up with the following issues;
P0300 misfire detection (total) exceeds limit value.
P0305 misfire, cylinder 5 exceeds limit value.
P1654 coolant shutoff valve exceeds limit value.
I'm going to do a little bit of research on the coolant code and work out what that could be but, I'm hoping the misfire could be as simple as a plug/coil pack but, I just thought I'd enquire here - I've had a brief look here but can't find anything obvious re cylinder 5 but, I was just wondering if there were any 'known' issues with cylinder 5 - near to something that can leak into it, proximity of a component that can cause issues, etc?
Looks like this could be a interesting ownership!
Apologies, I should have put a little bit more information!
It's a tiptronic and it drove fine (for 20 miles) and then the temperature failure warning light came on followed a few minutes later by the engine check light.
When this happened, the engine suddenly felt rough and it does feel like a misfire.
After that, the engine check light has varied from flashing to constant and the temperature failure light has 'rectified' itself temporarily and gone out and the gauge has functioned correctly, before failing again.
I can't find an obvious correlation between to two issues.
I'm guessing the misfire and cooling codes are 2 separate issues.
I'd:
1. Swap coil packs from left to right & vice versa.
2. The P1654 code on the tiptronic (after a quick root round on here and the web) could be pointing at an issue with the change over valve for the tiptronic cooling. It's on the side of the gearbox. It's an electronically operated vacuum switch.
Here's the thread on the cooling code:
H
Thread 'Failure indicator on my 997'
3 Feb 2013
I have now had the sensor changed by Porsche, final bill £240. I am clearly in the wrong line of work....
However, this has not sorted out the problem, there is still a fault on the ECU which reads P1654 - Coolant shut-off valve final stage.
Does anyone have any clues.
Thanks for any help in advance.
Hicko5
Replies: 9
Forum:
Porsche 911 997 (2004-2012)
