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I foolishly unplugged both O2 sensors at the same time..

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHI foolishly unplugged both O2 sensors at the same time..

Leading reported evidence

Replace ignition coils in cylinders 1 and 2

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
I have already replaced the ignition coils in cylinders 1 and 2, and replaced all spark plugs.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Read full discussion summary

Leading evidence: 'Replace ignition coils in cylinders 1 and 2' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace ignition coils in cylinders 1 and 2' (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

Replace spark plugs

Performed · outcome unconfirmed

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
I have already replaced the ignition coils in cylinders 1 and 2, and replaced all spark plugs.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Replace spark plugs and swapped one of the coils

Performed · outcome unconfirmed

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
This problem arose after I changed the spark plugs and swapped one of the coils.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Run terribly

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
You will know if they're plugged in incorrectly the car will run terribly.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

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.

Replace ignition coils in cylinders 1 and 2

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
I have already replaced the ignition coils in cylinders 1 and 2, and replaced all spark plugs.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Replace spark plugs

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
I have already replaced the ignition coils in cylinders 1 and 2, and replaced all spark plugs.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Replace spark plugs and swapped one of the coils

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
This problem arose after I changed the spark plugs and swapped one of the coils.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

Run terribly

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
You will know if they're plugged in incorrectly the car will run terribly.
Original post Read captured discussion
I foolishly unplugged both O2 sensors at the same time..

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.

Pelican Parts: 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: 20261027T020439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Hi, I foolishly unplugged both O2 sensors at the same time. Now I'm not sure which sensor cable plugs into which plug on the engine shelf. One is grey and the other is black. Also, on the driver's side of the car 1999 996 are the sensors basically the same as they are on the passenger side as shown on the photo? Essentially, the sensor closest to the rear and just up from the other sensor is after the catalytic converter, while the sensor connected to the larger exhaust pipe is the one before the sensor? Thanks. __________________ This post was auto-generated based upon a question asked on our tech article page here: Porsche 911 Carrera Oxygen Sensor Replacement - 996 (1998-2005) - 997 (2005-2012) - Pelican Parts Technical Article

POST 2Original post

If I remember correctly, the sensors plugs are color coded, and the black is before the cat and the grey is for the one that screws in to the cat (aka post cat). You will know if they're plugged in incorrectly the car will run terribly. The sensor closest to the rear and just up from the other sensor is after the catalytic converter, while the sensor connected to the larger exhaust pipe is the one before the cat. Yes you are correct! - Casey

POST 3Original post

I appreciate your reply. The plugs were reversed. It helped smooth out the missing a bit, but there is still a problem when I try to accelerate quickly. The engine starts missing, sometimes right after I push the gas pedal down and sometimes after the tach hits 4500 or 5000. But only when I put my foot into it with moderate pressure. If I push the gas pedal down gently, the engine doesn't miss and all is OK. I have already replaced the ignition coils in cylinders 1 and 2, and replaced all spark plugs. This problem arose after I changed the spark plugs and swapped one of the coils. Thanks again for everything. I have your 101 Projects book and really find it useful. Monte

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