PistonHeads

Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

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Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHFault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Leading reported evidence

Replace few over last couple of years

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
I have changed a few over last couple of years.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
I have changed a few over last couple of years.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Frequently discussed work

Check with them

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 am at Porsche Cardiff in morning collecting some parts,i will check with them.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Read full discussion summary

Leading evidence: 'Replace few over last couple of years' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check with them' (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 · 8 captured posts examined · 1 partial discussions

Compare 3 other evidence results

Test with the diagnostic tester

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
This can be tested with the diagnostic tester.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
This can be tested with the diagnostic tester.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Check with them

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 am at Porsche Cardiff in morning collecting some parts,i will check with them.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Use car so she took

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
She comes back and luckily her mum isn't using her car so she took that.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

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 with them

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 am at Porsche Cardiff in morning collecting some parts,i will check with them.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Replace few over last couple of years

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
I have changed a few over last couple of years.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
I have changed a few over last couple of years.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Test with the diagnostic tester

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
This can be tested with the diagnostic tester.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
This can be tested with the diagnostic tester.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

Use car so she took

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
She comes back and luckily her mum isn't using her car so she took that.
Original post Read captured discussion
Fault codes P0491 & P0492 - Page 1 - Boxster/Cayman - PistonHeads UK

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.

8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

PistonHeads: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link
Cleared the codes and took it out for about a 30 mile drive and the CEL has not returned.
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

The mrs took the car today to visit some friends in Bristol (we're in London) and about 15 mins into her journey I get a call saying the CEL light is on. She comes back and luckily her mum isn't using her car so she took that. I went to ECP and picked up a OBDII scanner and it comes up with: P0491 Secondary Air Injection System Insufficient Flow Bank 1 P0492 Secondary Air Injection System Insufficient Flow Bank 2 Cleared the codes and took it out for about a 30 mile drive and the CEL has not returned. Any ideas? 2005 987 2.7

POST 2Original post

Hi as u have both codes,i would go for the air pump failure. This can be tested with the diagnostic tester. I have changed a few over last couple of years. Chris

POST 3 / ORIGINAL POSTEROriginal post

cd1957 said: Hi as u have both codes,i would go for the air pump failure. This can be tested with the diagnostic tester. I have changed a few over last couple of years. Chris Hi Chris, many thanks for that. Do you know a part number please?

POST 4Original post

Hi sorry for slow response,flat out with faulty Porsche cars. Original part number is 997. 605.104.00 new part number 997.605.104.02 £550.09 plus vat. I have replaced about 4 in last few years,undrr the inlet manifold drivers side. Chris

POST 5 / ORIGINAL POSTEROriginal post

cd1957 said: Hi sorry for slow response,flat out with faulty Porsche cars. Original part number is 997. 605.104.00 new part number 997.605.104.02 £550.09 plus vat. I have replaced about 4 in last few years,undrr the inlet manifold drivers side. Chris Hi Chris, Thank you for that - where are you sourcing from? Design911 has them at circa £800 plus VAT

POST 6Original post

The price was on my Porsche Partslink system,shows opc retail prices. I have it at home,will double check. I am at Porsche Cardiff in morning collecting some parts,i will check with them.

POST 7Original post

The one on Design911 website is for Gen2 cars,its a 981 part number. The Porsche price is still showing £550. Chris

POST 8Original post

Bit of a resurrection, I’ve just had the same codes come up on mine. If I clear the codes could anyone advise how quick the EML come back on? Also, is it something that needs to be looked at asap or can it wait a bit?

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