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Swapped O2 sensors = Misfire codes (P0304-P0306)

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHSwapped O2 sensors = Misfire codes (P0304-P0306)

Leading reported evidence

Replace pre and post cat o2 sensors

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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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
While replacing my water pump I accidentally swapped the pre and post cat O2 sensors.
Original post Read captured discussion
Swapped O2 sensors = Misfire codes (P0304-P0306)

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Leading evidence: 'Replace pre and post cat o2 sensors' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace pre and post cat o2 sensors' (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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Run like crap and throw the codes

Suggestion or failed attempt

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion · Original poster
It would run fine but once the engine got warm it would run like crap and throw the codes.
Original post Read captured discussion
Swapped O2 sensors = Misfire codes (P0304-P0306)

Frequently discussed actions (2)

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Replace pre and post cat o2 sensors

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
While replacing my water pump I accidentally swapped the pre and post cat O2 sensors.
Original post Read captured discussion
Swapped O2 sensors = Misfire codes (P0304-P0306)

Run like crap and throw the codes

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
It would run fine but once the engine got warm it would run like crap and throw the codes.
Original post Read captured discussion
Swapped O2 sensors = Misfire codes (P0304-P0306)

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.

1 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: 20261026T072535Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, While replacing my water pump I accidentally swapped the pre and post cat O2 sensors. The car would throw codes for Misfire on cylinders 4,5,6 (P0306, P0304, P0305). Putting them back on the correct location again and no codes. There is connectors to the O2 sensors in the engine bay: - Black connector is Pre-cat - Gray connector is post cat See this for details http://911car.blogspot.com/2010/06/p...2-sensors.html The codes would appear once the engine got warm. It would run fine but once the engine got warm it would run like crap and throw the codes. I think the ECU ignores the O2 sensors when the engine is cold. The lambda values from Durametric would also be very strange, when everything is working the O2 sensor values should be around 1 and the pre/post cat voltage should "oscillate" between 0.1 and 0.9v. It should look something like this: Thank you for your help.

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