12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP0450
Leading reported evidence
Check codes immediately
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 codes immediately after replacing the sensor with the car at idle.
Leading evidence: 'Check codes immediately' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'least i could do' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check codes immediately' (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.
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.
Replace fuel tank pressure sensor, the one located
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 replaced my fuel tank pressure sensor, the one located under the battery tray.
Replace gas cap, fuel tank vent valve & purge valve
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
Replaced the gas cap, fuel tank vent valve & purge valve.
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
I appreciate and have benefited from the contributions of many others on this forum, so it was the least I could do to come back and let others know what fixed my P0451.
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
Nope did not miss an update, while I did replace the gas cap, I have not driven the car for almost two weeks, been too busy with work and planting/ redesigning the garden and back yard.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
least i could do
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
I appreciate and have benefited from the contributions of many others on this forum, so it was the least I could do to come back and let others know what fixed my P0451.
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.
12 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: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have done a search, but that does not mean I did it right.
That being said, I have a code P0450 showing up on my scanner, no CEL, code list point at the tank pressure sensor reading implausible (bad sensor?)
So, I have a few questions,
1, Is there a test I can perform on this sensor before I drop $125 for a replacement?
2, If I must replace it, where is it located/ how does one access it (I can assume it's on the tank, but you never know with these cars
)
Thanks in advance, Greg
Personally, I don't think it's a sensor. Replace the more obvious cause of a P0450. Believe it or not, the gas cap can cause problems with tank pressure and throw this code. It's a cheap part from Porsche. Next, is the bleeder value which is behind the fender liner. IMHO, many people rush to replace sensors, but in reality, they're doing there job to alert a problem. If it's not significant enough, to throw a CEL, then I would just start by replacing the gas cap and keep a close eye on other possibilities. You may also have a more serious fuel pressure issue with the fuel pump. More talented service techs here on Rennlist may have a better way to zero in on the exact problem.
I have been trying to find a solution to my P0451 code which also points toward the Fuel Tank Pressure sensor. I have no driveability issues. Do you?
Here is a link to the location of the Fuel Tank Pressure Sensor.
https://rennlist.com/forums/996-foru...with-pics.html
I have been chasing codes for the past year, but not really any driveability issues. I was having the P0455. Replaced the gas cap, fuel tank vent valve & purge valve. No longer getting the P0455, then started getting P0446 last year. This year I'm getting the P0451. I'd be interested in what works for your P0450.
I have seen tests on YouTube for this sensor.
If it were me, I'd do a smoke test on the EVAP system.
But to safely smoke test the EVAP system requires nitrogen.
Most technicians, and shops, don't have nitrogen for some reason that I don't understand!
If I can afford a nitrogen tank for my smoke machine, why can't most shops?
I replaced the cap last year. It seems to be holding vacuum now. I can hear the sucking noise when I remove the cap now. When I first got the car just over a year ago I didn't always have that.
Same part number as Porsche but half price:
RKX Gas cap replacement seal Fuel
https://www.amazon.com/gp/product/B01MSJFWCT/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01MSJFWCT/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
I replaced my fuel tank pressure sensor, the one located under the battery tray. It was a bit hard to pull off due to the amount of vacuum holding it in place. It made a sucking noise for a few seconds after pulling it off.
There was a pending P0451 code prior to removing the sensor. I checked the codes immediately after replacing the sensor with the car at idle. The code was no longer pending. Then I went for a 10 minute ride and warmed the car up. The code never came back. So it appears this sensor was faulty.
I appreciate and have benefited from the contributions of many others on this forum, so it was the least I could do to come back and let others know what fixed my P0451. For my 03 C4S it was Bosch PN 0261230015. The part I removed was stamped Bosch with the same part number on it.
Thank you all for the suggestions.
Nope did not miss an update, while I did replace the gas cap, I have not driven the car for almost two weeks, been too busy with work and planting/ redesigning the garden and back yard.
Once this is all settled, I will have my weekends back, and get some miles on it.
I will update as soon as I have something.
Greg
