Planet-9

HELP: ODBC!! code P0491 - Secondary Air Injection System

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Original source

3 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHHELP: ODBC!! code P0491 - Secondary Air Injection System

Reported or suspected cause

failure of the secondary air injection pump

Reported cause

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

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 report identifying a cause: 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.

Reported cause
My issue turned out to be failure of the secondary air injection pump.
Original post Read captured discussion
HELP: ODBC!! code P0491 - Secondary Air Injection System

Frequently discussed work

Check bottom two items

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 know how to check the bottom two items on the list.
Original post Read captured discussion
HELP: ODBC!! code P0491 - Secondary Air Injection System

Read full discussion summary

Leading evidence: 'failure of the secondary air injection pump' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'failure of the secondary air injection pump' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check bottom two items' (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 · 1 partial discussions

Compare 1 other evidence results

Check bottom two items

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 know how to check the bottom two items on the list.
Original post Read captured discussion
HELP: ODBC!! code P0491 - Secondary Air Injection System

Frequently discussed actions (1)

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

Check bottom two items

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 know how to check the bottom two items on the list.
Original post Read captured discussion
HELP: ODBC!! code P0491 - Secondary Air Injection System

Reported and suspected causes (1)

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

failure of the secondary air injection pump

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that report identifying a cause: 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.

Reported cause
My issue turned out to be failure of the secondary air injection pump.
Original post Read captured discussion
HELP: ODBC!! code P0491 - Secondary Air Injection System

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.

Planet-9: 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: 20261026T203514Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Have 2006 987 Boxster Base 2.7. Got the Check Engine Light a few days ago and when I attached the ODBCII device received the code identified above. Google search suggests it may be a disconnected or damaged vacuum hose. Does that sound right or is the issue likely something different? There are lots a vacuum hoses on this engine. Does anyone have any experience with this code and if so would you please provide some guidance on where to start looking? For starters, where is the secondary air induction system located? With that information, maybe I could start there with hoses connected to that point. Cheers.

POST 2Original post

Found the following on ********. I know how to check the bottom two items on the list. Scratching my head on how to diagnose the rest of the list. P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow Possible cause of fault - Electrical fault in power supply or line between relay and secondary air injection pump - Secondary air injection pump relay mechanically faulty - Mechanical fault in electrical secondary air valve - Pneumatic secondary air valve faulty/sluggish - Electrical fault in secondary air injection pump - Mechanical fault in secondary air injection pump or secondary air injection pump blocked - Vacuum system leaking - Air hose to secondary air injection pump slipped off or constricted

POST 3Original post

My issue turned out to be failure of the secondary air injection pump. That was $800 for the part and $400 for diagnostics and labor.

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