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Anyone seen this fault code?

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHAnyone seen this fault code?

Reported or suspected cause

bellows tube - a $20 part

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
I had some odd codes on my '99 a couple years back, and after much searching, it was the bellows tube - a $20 part but about an hour labor to replace.
Original post Read captured discussion
Anyone seen this fault code?

Frequently discussed work

Replace 2nd coolant tank too

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
I'll have them replace my 2nd coolant tank too!
Original post Read captured discussion
Anyone seen this fault code?

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Leading evidence: 'bellows tube - a $20 part' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'bellows tube - a $20 part' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace 2nd coolant tank too' (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.

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1 matching discussions · 7 captured posts examined · 0 partial discussions

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Replace 2nd coolant tank too

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
I'll have them replace my 2nd coolant tank too!
Original post Read captured discussion
Anyone seen this fault code?

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.

Replace 2nd coolant tank too

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
I'll have them replace my 2nd coolant tank too!
Original post Read captured discussion
Anyone seen this fault code?

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.

bellows tube - a $20 part

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
I had some odd codes on my '99 a couple years back, and after much searching, it was the bellows tube - a $20 part but about an hour labor to replace.
Original post Read captured discussion
Anyone seen this fault code?

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.

7 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: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Dealer printed out fault codes (2) 1. O2 sensor 2. "Unknown circuit" They said they did not know what unknown circuit was and would have to diagnose... Car is running fine and no sense of performance or gas milage loss to me... Thx. Robert

POST 2Original post

I had some odd codes on my '99 a couple years back, and after much searching, it was the bellows tube - a $20 part but about an hour labor to replace. Best of luck on that one. We had a strange reading on the O2 level, but I don't recall the fault code.

POST 3Original post

Did they give you the actual number?

POST 4Original post

"Unknown circuit" that just may be the infamous: "SDR West Lot" fault

POST 5Original post

We still need more information to try and help you out here. The fault will have a number and a description. There are probably 20 different 02 sensor related faults.

POST 6Original post

You don't say wheather or not the check engine light is on. If not, what prompted you to have the codes read?. If it is, reset it and see if it comes back on. In addition, if you have a laptop, go out and invest in a an OBD software program so you can look at each individual sensor in the car. If you don't have a laptop, there are several units out there you can purchase. To me, this tool is a must. It helps you learn the normal settings of your engine and if a problem comes up, you can easily identify the components that have changed.

POST 7 / ORIGINAL POSTEROriginal post

Check engine light has been coming on and off for 6 months now. Dealer said if it stays on for more than a week to come in!!! I'll have them replace my 2nd coolant tank too!

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