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Planet-9

o2 sensor question

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6 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHo2 sensor question

Leading reported evidence

Use fouler

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes
0
Unsuccessful attempts
1
Discussions
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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

What I did was use the fouler to extend the o2 sensor so that gets out of the exhaust gas' way and therefore not tripping the CEL.

Original post Read captured discussion
o2 sensor question
Frequently discussed work

Adjust fuel mixture

No successful repair reported for this finding.

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Reported fixes
0
Unsuccessful attempts
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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

The first sensor is used to adjust the fuel mixture for the engine.

Original post Read captured discussion
o2 sensor question
Read full discussion summary

Leading evidence: 'Use fouler' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust fuel mixture' (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 · 6 captured posts examined · 1 partial discussions

Compare 4 other evidence results

Use straight pipe

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

On my S2000, I used a straight pipe with a sparkplug fouler to trick the second o2 sensor into thinking that there's no test pipe.

Original post Read captured discussion
o2 sensor question

Adjust fuel mixture

Suggestion or failed attempt

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 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

The first sensor is used to adjust the fuel mixture for the engine.

Original post Read captured discussion
o2 sensor question

Run right

Suggestion or failed attempt

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 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

As previously mentioned the first O2 sensor is needed or your car won't run right.

Original post Read captured discussion
o2 sensor question

Set ups

Suggestion or failed attempt

No successful repair reported for this finding.

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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 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

The sensors work the same on all OBDII set ups.

Original post Read captured discussion
o2 sensor question
Frequently discussed actions (6)

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

Adjust fuel mixture

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

The first sensor is used to adjust the fuel mixture for the engine.

Original post Read captured discussion
o2 sensor question

Run right

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

As previously mentioned the first O2 sensor is needed or your car won't run right.

Original post Read captured discussion
o2 sensor question

Set ups

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

The sensors work the same on all OBDII set ups.

Original post Read captured discussion
o2 sensor question

Test pipe

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

On my S2000, I used a straight pipe with a sparkplug fouler to trick the second o2 sensor into thinking that there's no test pipe.

Original post Read captured discussion
o2 sensor question

Use fouler

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

What I did was use the fouler to extend the o2 sensor so that gets out of the exhaust gas' way and therefore not tripping the CEL.

Original post Read captured discussion
o2 sensor question

Use straight pipe

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

On my S2000, I used a straight pipe with a sparkplug fouler to trick the second o2 sensor into thinking that there's no test pipe.

Original post Read captured discussion
o2 sensor question
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.

6 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: 20261027T035758Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Hi Guys, As I understand it, there are 2 o2 sensors on each header. One before the cat and one after the cat. What are their different roles? On my S2000, I used a straight pipe with a sparkplug fouler to trick the second o2 sensor into thinking that there's no test pipe. What I did was use the fouler to extend the o2 sensor so that gets out of the exhaust gas' way and therefore not tripping the CEL. Can we do the same for our Cayman ? I was thinking about getting the Fabspeed exhaust with no cat and do the same thing (extending the o2 sensor outside of the exhaust gas' way) so that i don't trip my CEL. Does the secondary o2 sensor have any other role other than tripping the CEL for emissions purpose? Thanks

POST 2Original post

The sensors work the same on all OBDII set ups. One before the cat, one after. The computer compares the two values to make sure the catalytic converters are performing their task of reducing polution properly. Everyones interest in eliminating the catalytic converters really annoys me. Why? Because it says you couldn't care less about the environment and are willing to polute the air so you can pick up 1 or 2 horsepower.

POST 4Original post

The first sensor is used to adjust the fuel mixture for the engine. The second is to make sure the cat is working correctly. Don't know if can eliminate the second I would not eliminate the first.

POST 5Original post

As previously mentioned the first O2 sensor is needed or your car won't run right. The 2nd sensor is just to judge cat efficiency and could be turned off via reprogramming the ECU to euro specs, I don't know if this fouler/extender idea will work or not but you need to ask yourself "why" first. Fabspeed headers without cats dyno lower HP numbers than Milltek headers with cats. If your reason for going non-cats is because you believe they will produce more HP you will find that belief to be in error.

POST 6Original post

hm... point taken... time to sit back and read on...

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