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Check Engine Light but no codes??

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14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHCheck Engine Light but no codes??

Reported or suspected cause

often the simplest

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

"Occam's Razor" at work - the answer to a problem is often the simplest.

Check Engine Light but no codes??
Frequently discussed work

Check oil filler tube cap

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

Check the oil filler tube cap - with the engine idling -- to see if you can move it around and if the engine reacts.

Check Engine Light but no codes??
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Leading evidence: 'often the simplest' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'often the simplest' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check oil filler tube cap' (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 · 14 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Run code

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 · Original poster

I went to a different autozone and they ran the code but once again nothing was showing up...he then ran my car in the system as a 911 AWD and the vin popped up along with the code which is P0455 (fuel tank vent system leak)

Check Engine Light but no codes??

Check oil filler tube cap

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

Check the oil filler tube cap - with the engine idling -- to see if you can move it around and if the engine reacts.

Check Engine Light but no codes??

Replace pin state

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

Once the engine has started then the DME goes through and if it finds no reason to leave the light on changes the pin state to extinguish the light.

Check Engine Light but no codes??

Use 20% off coupon

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

You can pick up a cheap code reader from Harbor Freight for about $55, and even less if you use the 20% off coupon that comes out about once a week.

Check Engine Light but no codes??
Frequently discussed actions (4)

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

Check oil filler tube cap

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

Check the oil filler tube cap - with the engine idling -- to see if you can move it around and if the engine reacts.

Check Engine Light but no codes??

Replace pin state

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

Once the engine has started then the DME goes through and if it finds no reason to leave the light on changes the pin state to extinguish the light.

Check Engine Light but no codes??

Run code

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 · Original poster

I went to a different autozone and they ran the code but once again nothing was showing up...he then ran my car in the system as a 911 AWD and the vin popped up along with the code which is P0455 (fuel tank vent system leak)

Check Engine Light but no codes??

Use 20% off coupon

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

You can pick up a cheap code reader from Harbor Freight for about $55, and even less if you use the 20% off coupon that comes out about once a week.

Check Engine Light but no codes??
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.

often the simplest

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

"Occam's Razor" at work - the answer to a problem is often the simplest.

Check Engine Light but no codes??
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.

14 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Anyone experience this? I couldnt really find much in search but the car drives like normal, pretty much stock everything. I had it scanned at autozone but they didnt find any codes

POST 2Original post

Quotes source post: 13142229

You may want to try anothet autozone or another scanner. Highly unlikely to have CEL and no codes.

POST 3Original post

You can pick up a cheap code reader from Harbor Freight for about $55, and even less if you use the 20% off coupon that comes out about once a week. While the cheap reader is no Durametric, it *WILL* at least give you the numeric code, and you can then google it or ask here. As an example, mine will textually identify that I might have a cyl 1 misfire (P0301 - I think) in addition to the code, but it had no idea what a P1341 error was. But it does give you the code.

POST 4Original post

You can pick up a BT OBDII scanner for $30ish. (Haven't checked in a while) I would rather get that instead of a HF scanner.

POST 5Original post

Quotes source post: 13142229

You sure the CEL is on and not some other warning light? If the CEL is on then there should be an active (or maybe a permanent) error code. It would have to be a sorry OBD2 code reader not to read the code, unless perhaps the code was out of the code reader's range. There is one other possibility. The CEL could be stuck on due to an electrical malfunction in the gage cluster. The way I understand (well, partially understand) how the thing works is all the LEDs are powered via a common power line, but to light the LED requires an I/O pin be driven either high or low. When you first turn on the key all warning lights light up because each LED's pin state's default state completes the circuit. Once the engine has started then the DME goes through and if it finds no reason to leave the light on changes the pin state to extinguish the light. So if you are sure the CEL LED is in fact on and there is no active or permanent error code then you have to consider an electrical fault.

POST 6 / ORIGINAL POSTEROriginal post

I went to a different autozone and they ran the code but once again nothing was showing up...he then ran my car in the system as a 911 AWD and the vin popped up along with the code which is P0455 (fuel tank vent system leak)

POST 7Original post

Check if your gas cap is tightly on and if its o-ring has cracks. Other potential causes here http://www.renntech.org/forums/topic...code-is-p0455/

POST 8 / ORIGINAL POSTEROriginal post

Quotes source post: 13142960

That article is the first one I came across actually! I do think the gas cap needs replacement

POST 9Original post

Quotes source post: 13143742

"Occam's Razor" at work - the answer to a problem is often the simplest.

POST 10Original post

That happened to me at least once where the light was on and my cheap bluetooth reader didn't come up with anything. Figured that if it was able to clear it, and if it didn't come back, that it wasn't a big deal.

POST 11 / ORIGINAL POSTEROriginal post

Is that the o-ring you guys are talking about?

POST 13Original post

yup what he ^^^ said. Those pics show the culprit. The o-ring can get brittle and crack.

POST 14Original post

Looks a bit worse than the gas cap from my 2002 Boxster. The tether broke a few months back and I ordered a new cap with a new tether. After I got the new cap I looked at both the new one and the old one closely and noticed the rubber seal/o-ring had cracks/splits in it like in the picture. Not quite as bad but close. The old cap was not leaking but it was not far from it. Check the oil filler tube cap - with the engine idling -- to see if you can move it around and if the engine reacts. I've worn out two of these caps in nearly 300K miles.

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