986Forum

O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Add to repair workspace

New repair projectOpen repair workspace

Original source

3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHO2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Check with durametric, got p0140 - o2 sensor behind cat

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
Checked with Durametric, got P0140 - O2 sensor behind cat.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Check continuity

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
I would think your wiring somewhere got jammed somewhere due to the collision, I 'd check continuity from the connector pins to the DME.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'Check with durametric, got p0140 - o2 sensor behind cat' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check continuity' (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.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Check continuity

Suggestion or failed attempt

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
I would think your wiring somewhere got jammed somewhere due to the collision, I 'd check continuity from the connector pins to the DME.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Repair solid cel comes

Suggestion or failed attempt

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 · Original poster
30 miles into drive home from collision center after repair, solid CEL comes on.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Use durametric so bear

Suggestion or failed attempt

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 · Original poster
This is the first time I have had to use my Durametric so bear with me!
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check continuity

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
I would think your wiring somewhere got jammed somewhere due to the collision, I 'd check continuity from the connector pins to the DME.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Check with durametric, got p0140 - o2 sensor behind cat

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
Checked with Durametric, got P0140 - O2 sensor behind cat.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Repair solid cel comes

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 · Original poster
30 miles into drive home from collision center after repair, solid CEL comes on.
Original post Read captured discussion
O2 sensor codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Use durametric so bear

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 · Original poster
This is the first time I have had to use my Durametric so bear with me!
Original post Read captured discussion
O2 sensor codes - 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.

3 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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Looking for some insight please. Stock 1998 boxster manual, car was impacted pretty good on driver's rear quarter. 30 miles into drive home from collision center after repair, solid CEL comes on. I continued drive home, another 100 miles. Checked with Durametric, got P0140 - O2 sensor behind cat. converter cyl (4-6). Erased code, drove it again, after 8 miles solid CEL and took it home. Codes were P0160, P1121 and P0140. Cleared codes. Swapped post cat sensors left to right, drove, 24 miles in got solid CEL. Coded P0140. Since code did not follow sensor I cleared code again. Today drove 28 miles, car up to operating temp, no CEL ---until I hopped out at home to open the garage door. Didn't turn car off, hooked up Durametric got code P0140. Also captured actual value graph of all 4 sensors. My question is does this graph tell me anything? Any thoughts or suggestions on what route I should take? This is the first time I have had to use my Durametric so bear with me! Thanks.

POST 2Original post

Code P0140 means interruption of signal, you probably know that by now. I would think your wiring somewhere got jammed somewhere due to the collision, I 'd check continuity from the connector pins to the DME. Those pins sometimes can move within the connector, this can also cause this kind of failure. As for your picture, it's hard to see what's going on, a video woud be better. What I can make out of it seems fine though. Your pre-cat signal should be oscillating between 0 and 1, while your post-cat signal should be a relatively flat line. So, I would think the system was working fine at the moment of taking the recording, and it threw the code while you were driving when the signal got interrupted.

POST 3 / ORIGINAL POSTEROriginal post

Thanks Homeoboxster! When it warms up tomorrow I am going to check this out. Another chap suggested this "interruption of signal" too. I'll let you both know how it goes. Thanks again.

This is a source reference. Confirm exact model applicability in the original material.