911uk

Sports exhaust switch faulty ???

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHSports exhaust switch faulty ???

Reported or suspected cause

on the relay, in

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
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 suspect 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.

Suspected cause
wonder if the problem is on the relay, in which case why not remove the diode on pin no 1 then the exhaust is in the permanent loud setting and doesnt go into quiet mode between 25 &45 mph
Original post Read captured discussion
Sports exhaust switch faulty ???

Frequently discussed work

Recommend wd/40

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 is genuine PSE so that must mean its vacuum operated valves, so is there anything you would recommend WD/40?
Original post Read captured discussion
Sports exhaust switch faulty ???

Read full discussion summary

Leading evidence: 'on the relay, in' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'on the relay, in' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Recommend wd/40' (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 · 0 partial discussions

Compare 1 other evidence results

Recommend wd/40

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
It is genuine PSE so that must mean its vacuum operated valves, so is there anything you would recommend WD/40?
Original post Read captured discussion
Sports exhaust switch faulty ???

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.

Recommend wd/40

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 is genuine PSE so that must mean its vacuum operated valves, so is there anything you would recommend WD/40?
Original post Read captured discussion
Sports exhaust switch faulty ???

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.

on the relay, in

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect 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.

Suspected cause
wonder if the problem is on the relay, in which case why not remove the diode on pin no 1 then the exhaust is in the permanent loud setting and doesnt go into quiet mode between 25 &45 mph
Original post Read captured discussion
Sports exhaust switch faulty ???

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.

911uk: 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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a switchable sports exhaust on my C4S and the dashboard switch seems to have an intermittent fault. Does anybody know how to access these switches and replace them?

POST 2Original post

you can take off the 'horseshoe' that houses the switch fairly easily, ist held in by spring clips, pop a credit card underneath the hoop at the bottom corner and ease it out wonder if the problem is on the relay, in which case why not remove the diode on pin no 1 then the exhaust is in the permanent loud setting and doesnt go into quiet mode between 25 &45 mph

POST 3Original post

Try WD40 on the electric valves on the exhaust, if these are siezing the relay will trip out. Seems to fit in with being intermittent more so than the switch.

POST 4Original post

If it's a genuine PSE, the valves on the exhaust are actuated by vacuum. The vacuum lines (stainless braided to protect from the heat) then route to 12v solenoids, well away from the exhaust.

POST 5 / ORIGINAL POSTEROriginal post

It is genuine PSE so that must mean its vacuum operated valves, so is there anything you would recommend WD/40? If so where are they located? Cheers

POST 6 / ORIGINAL POSTEROriginal post

Is there any wiring drawings for this cct and or pics where the valves are on the exhaust?

POST 7Original post

This is the PSE silencer, shown with butterfly valve actuator at the top of the silencer.

POST 8Original post

Another view of the actuator - you can see the link rod between the vacuum actuator and the butterfly valve ball joint. I can't really see that WD40 is going to do any good on these components as the amount of heat will simply vapourize any WD40 the first time you drive the car away....

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