Rennlist

P1276 after O2 sensor

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHP1276 after O2 sensor

Leading reported evidence

Clean mass air flow 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
Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car.
Original post Read captured discussion
P1276 after O2 sensor

Frequently discussed work

Check intake/vacuum leaks

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
How would I check for vacuum leak?
Original post Read captured discussion
P1276 after O2 sensor

Read full discussion summary

Leading evidence: 'Clean mass air flow sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check intake/vacuum leaks' (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 · 4 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Run two bottles of cleaner through car

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 · Original poster
Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car.
Original post Read captured discussion
P1276 after O2 sensor

Check intake/vacuum leaks

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
How would I check for vacuum leak?
Original post Read captured discussion
P1276 after O2 sensor

Replace right one and is it a bosch sensor

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
Are you sure you replaced the right one and is it a Bosch sensor with the correct p/n?
Original post Read captured discussion
P1276 after O2 sensor

Use mechanic's stethoscope

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
Another way is to use a mechanic's stethoscope with a rubber tube to probe around for air leak noise.
Original post Read captured discussion
P1276 after O2 sensor

Frequently discussed actions (7)

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

Check intake/vacuum leaks

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
How would I check for vacuum leak?
Original post Read captured discussion
P1276 after O2 sensor

Clean mass air flow sensor

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
Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car.
Original post Read captured discussion
P1276 after O2 sensor

Combined work: Clean mass air flow sensor + Run two bottles of cleaner through car

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt · Original poster
Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car. Still getting CEL and P1276.
Original post Read captured discussion
P1276 after O2 sensor

Replace right one and is it a bosch sensor

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
Are you sure you replaced the right one and is it a Bosch sensor with the correct p/n?
Original post Read captured discussion
P1276 after O2 sensor

Run two bottles of cleaner through car

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
Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car.
Original post Read captured discussion
P1276 after O2 sensor

Use mechanic's stethoscope

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
Another way is to use a mechanic's stethoscope with a rubber tube to probe around for air leak noise.
Original post Read captured discussion
P1276 after O2 sensor

Use smoke machine

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
Of couse the professional way is to use a smoke machine.
Original post Read captured discussion
P1276 after O2 sensor

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.

4 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: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a 2000 C2, 72k. Keep getting p1276. Cleaned MAF changed up stream O2, and ran two bottles of cleaner through car. Still getting CEL and P1276. Motor has 47k replaced in 2011 ..?

POST 2Original post

P1276 is bank 2 precat O2 sensor, which is on the passenger side. Are you sure you replaced the right one and is it a Bosch sensor with the correct p/n? You can also swap the precat sensor between the 2 banks. If the code follows the bank, there may be vacuum leak between the bank2 header and the cat.

POST 3 / ORIGINAL POSTEROriginal post

I changed the one on the passenger side. How would I check for vacuum leak? Thanks!!!

POST 4Original post

Usually exhaust leak will leave some carbon trail so you can at least visually check the header gasket between the engine block exhaust and the header. Also there's a gasket between the header and the cat. Another way is to use a mechanic's stethoscope with a rubber tube to probe around for air leak noise. Of couse the professional way is to use a smoke machine. If you have an odbii scanner that reads O2 sensor voltage in realtime, it will help you diagnose it further.

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