7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHO2 Sensor
Leading reported evidence
Use bosch sensors
Performed · outcome unconfirmed
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0
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0
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1
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Performed · outcome unconfirmed
For the Turbo the tech -- at an indy shop -- used Bosch sensors that were the "same" as the factory sensors (probably Bosch too) but available at a lower price, but not that much lower a price.
Leading evidence: 'Use bosch sensors' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace 4 sensors' (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.
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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.
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Use discount sensors i don't recall where they were sourced
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0
Reported fixes
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Unsuccessful attempts
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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.
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Performed · outcome unconfirmed
For sensors some owners have used discount sensors I don't recall where they were sourced.
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.
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Suggestion
If the car's mileage is "up there" you may want to consider replacing all 4 sensors.
Discussions that performed work without a confirmed outcome
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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
For the Turbo the tech -- at an indy shop -- used Bosch sensors that were the "same" as the factory sensors (probably Bosch too) but available at a lower price, but not that much lower a price.
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
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Generation: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
2001 C4. CEL code P1117. I think that is the downstream sensor on the left side. What O2 sensors are people using? What is a good sensor at a reasonable price?
Thanks for looking
Lang
Lang, that code could be wiring issue or the sensor itself. Can your scanner read O2 sensor voltage in real-time? If you want to try your luck by not diagnosing, this sensor should be correct for your model
Amazon.com: Bosch 15250 Oxygen Sensor, OE Type Fitment: Automotive
Amazon.com: Bosch 15250 Oxygen Sensor, OE Type Fitment: Automotive
Thanks Ahsai.
I am using Dash Command in the car. I don't know if it will read (show me) the actual sensor output. I'll look. Thanks for the link on a sensor. That is the best price I have seen so far on a sensor with the plug on it.
Regards.
Perfect. When the car is fully warmed up and idling with a/c off, a healthy reading should look something like this
https://rennlist.com/forums/996-foru...l#post11315385
If you have a short in the post-cat wiring, the post-cat voltage should peg to max (~1.0v) or min (~0v). If the senor is bad, you should get some values in between 0-1v most of the time.
#2 sensor bank #1. Heating fault.
Had the same error on my 996 Turbo at around 131K miles. Had all 4 sensors replaced.
Unless the sensor is relatively new my advice is you should replace at least both sensors -- the one pointed to by the error code and its counter part on the other bank -- to ensure both sensors are the same to help keep the fueling of both banks the same and closer to ideal.
If the car's mileage is "up there" you may want to consider replacing all 4 sensors.
For sensors some owners have used discount sensors I don't recall where they were sourced. For my two Porsches I've only used OE sensors.
Check that. For the Turbo the tech -- at an indy shop -- used Bosch sensors that were the "same" as the factory sensors (probably Bosch too) but available at a lower price, but not that much lower a price. So far the sensors are ok but of course I've only put around 3K to 4K miles on them, not the 130K+ miles the original sensors had before I replaced them.
This is a source reference. Confirm exact model applicability in the original material.
