5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSkipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace bank one sensor
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 performed work without a confirmed outcome
1
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.
Performed · outcome unconfirmed · Original poster
I replaced the bank one sensor, replaced all plugs and coils.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Replace bank one sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check cam deviation values vs spec' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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 performed work without a confirmed outcome
1
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.
Performed · outcome unconfirmed · Original poster
I replaced the bank one sensor, replaced all plugs and coils.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run cam deviation
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 performed work without a confirmed outcome
1
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.
Performed · outcome unconfirmed · Original poster
I also ran a cam deviation test and was slightly out of the "normal" range, but not by much.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check cam deviation values vs spec
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
1
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
If it is, check the cam deviation values vs spec, and check the cam positions with and without the Vario Cam activated for the expected values.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check cam positions
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
1
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
If it is, check the cam deviation values vs spec, and check the cam positions with and without the Vario Cam activated for the expected values.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check signal, if it is there, start tracing the harness
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
If the DME is not seeing the cam position values, I would back probe the harness connector for the sensor checking for the signal, if it is there, start tracing the harness from the sensor to the DME.
Skipped timing questions - 2001 986 S 130k - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261026T061123Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
Been struggling with an issue the last few months. The issue seemed to begin with a clogged eBay high flow catalytic converter. I had poor idle one day and gave the car some throttle a few times and part of the molten catalyst was ejected from the exhaust. I removed the cats and have race pipes.
Since then I've had a p0343 code(Porsche code 112), cam position 1 sensor above limit. Also some misfire codes.
I replaced the bank one sensor, replaced all plugs and coils. I also ran a cam deviation test and was slightly out of the "normal" range, but not by much. The biggest issue seems to be at idle, the idle is awful. Limited throttle response, backfires, etc. When the car will rev, it's sounds normal. I drive it around the block a few weeks back (gingerly) and while driving it sounded fine.
Questions:
Is there a way to rule out, or diagnose and true timing issue?
Does anyone know how to test the cam sensor wiring? I see a lot of comments to check that. I did not see any wiring issues with the cam sensor when replacing it.
I'm really trying to diagnose if the clogged cat and related back pressure caused the timing chain to skip.
Thanks!
The P0343 diagnostic trouble code on a 2001 Porsche Boxster (which corresponds to Porsche code 112) indicates a Camshaft Position Sensor "A" Circuit High Input on Bank 1. This means the engine control module (DME) is receiving an abnormally high voltage signal (typically above 4.5V) from the sensor.
Potential Causes
The issue is likely electrical, a sensor failure, or potentially a mechanical timing problem.
Faulty Camshaft Position (CMP) Sensor: Internal failure due to heat, age, or oil contamination is a common cause.
Wiring/Connector Issues:
Frayed, chafed, or damaged wiring in the harness.
A short circuit in the signal wire to a higher voltage source (like the 12V battery line, or B+).
Poor connections, corroded terminals, or loose pins at the sensor or DME connector.
DME (Engine Control Module) Failure: Though rare, an internal DME problem or outdated software could misinterpret the signal.
I'm 100% with you there. Do you, or anyone, know a way to diagnose? The code was not present prior to the cat failure. Common sense tells me it's likely timing, but I don't know how to confirm, or how to test an electrical issue. Is it as simple as putting a multimeter on the connectors? Are there any relays that could have failed? I don't know much about the cam timing.
I would start with a Porsche specific scan tool and see if the DME is actually seeing a signal from the sensor in question. If it is, check the cam deviation values vs spec, and check the cam positions with and without the Vario Cam activated for the expected values.
If the DME is not seeing the cam position values, I would back probe the harness connector for the sensor checking for the signal, if it is there, start tracing the harness from the sensor to the DME.
Thanks, that's a solid diagnostic path. I'll start with the scan tool and follow the signal from there.
_________________________
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