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HO2S Heater control Circuit Low

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

Discussion summary

YOUR RESEARCHHO2S Heater control Circuit Low

Leading reported evidence

Check fuse box and the 25 amp fuse

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

I checked the fuse box and the 25 amp fuse on row D F6 which governs the oxygen sensor and heater for both before and after the catalytic converter was blown.

Original post Read captured discussion
HO2S Heater control Circuit Low
Read full discussion summary

Leading evidence: 'Check fuse box and the 25 amp fuse' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuse box and the 25 amp fuse' (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 · 4 captured posts examined · 1 partial discussions

Compare 4 other evidence results

Recommend good place

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

If so, please recommend a good place to purchase these parts.

Original post Read captured discussion
HO2S Heater control Circuit Low

Replace 4 o2 sensors

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

Does it sound like I need to replace all 4 O2 sensors?

Original post Read captured discussion
HO2S Heater control Circuit Low

Replace fuse and see if it blows

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

Before you connect the new sensors you might want to replace the fuse and see if it blows with no sensors connected.

Original post Read captured discussion
HO2S Heater control Circuit Low

Run cold and cold the sensor will not work 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

Generally an O2 sensor heater fails with a break in the circuit that results in the sensor running cold and cold the sensor will not work right.

Original post Read captured discussion
HO2S Heater control Circuit Low
Frequently discussed actions (7)

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

Check fuse box and the 25 amp fuse

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

I checked the fuse box and the 25 amp fuse on row D F6 which governs the oxygen sensor and heater for both before and after the catalytic converter was blown.

Original post Read captured discussion
HO2S Heater control Circuit Low

Recommend good place

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

If so, please recommend a good place to purchase these parts.

Original post Read captured discussion
HO2S Heater control Circuit Low

Replace 4 o2 sensors

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

Does it sound like I need to replace all 4 O2 sensors?

Original post Read captured discussion
HO2S Heater control Circuit Low

Replace fuse and see if it blows

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

Before you connect the new sensors you might want to replace the fuse and see if it blows with no sensors connected.

Original post Read captured discussion
HO2S Heater control Circuit Low

Run cold and cold the sensor will not work 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

Generally an O2 sensor heater fails with a break in the circuit that results in the sensor running cold and cold the sensor will not work right.

Original post Read captured discussion
HO2S Heater control Circuit Low

Use any thread lube

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

Avoid using any thread lube that is not specially formulated for use with O2 sensors.

Original post Read captured discussion
HO2S Heater control Circuit Low

Use with o2 sensors

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

Avoid using any thread lube that is not specially formulated for use with O2 sensors.

Original post Read captured discussion
HO2S Heater control Circuit Low
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.

4 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: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

Hello Everybody, I just joined Planet-9 and I have found a lot of helpful information on Porsche Cayman . I just bought a used 2006 Porsche Cayman S with about 49k miles on it. I really like the car and I enjoyed driving it. Unfortunately, not too long after I purchased the car, the CEL came on. I managed to pull the following codes: P0037 17 P0037 HO2S Heater Control Circuit Low (Bank 1, Sensor 2) P0057 17 P0057 HO2S Heater Control Circuit Low (Bank 2, Sensor 2) P0031 17 P0031 HO2S Heater Control Circuit Low (Bank 1, Sensor 1) P0051 17 P0051 HO2S Heater Control Circuit Low (Bank 2, Sensor 1) I checked the fuse box and the 25 amp fuse on row D F6 which governs the oxygen sensor and heater for both before and after the catalytic converter was blown. I replaced it and immediately upon startup, the fuse blew again. So, there must be some overload on the current through that fuse. Does anybody has any similar experience? Could anybody offer any insight to the problem? Does it sound like I need to replace all 4 O2 sensors? If so, please recommend a good place to purchase these parts. Thanks for all your help. Any feedback and direction is greatly appreciated.

POST 2Original post

There are several places that sell sensors, if you do not want to buy from your local Porsche dealer parts department. Pelican Parts and Sun Coast (or Suncoast ) are two that (admittedly barely) come to mind. Generally an O2 sensor heater fails with a break in the circuit that results in the sensor running cold and cold the sensor will not work right. To have a sensor fail with some kind of short... When you remove the old sensors check very carefully the sensor connector and the wiring harness connector for any signs of bent/broken pins/sockets. Carefully trace the wiring of the sensor looking to see if a wiring lead was making contact with a hot exhaust pipe or a wiring lead retainer has gone missing and allowed the wiring lead to rub or chaff and wear the insulation off. Before you connect the new sensors you might want to replace the fuse and see if it blows with no sensors connected. It is rare but the problem might be with the DME , or between the sensor connectors and the DME , IOWs the wriing harness that runs from the connnectors to the DME (located against the forward bulkhead of the rear trunk, IIRC. Handle the new sensors with care! Do not touch the tips! Avoid using any thread lube that is not specially formulated for use with O2 sensors. IIRC, when I bought sensors from the dealer the threads already had a light coating of something on them. I never used any thread lube. Sincerely, Rockster.

POST 4Original post

My shop told me that this is the same issue I have. My car was making a high-pitched whining noise just after the check engine light came on and I had no idea that a sensor heater could cause this kind of audible noise. Is this the case or could it be something else

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