7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHTroubleshooting Error Codes and CEL
Reported repair
Replace mass air flow sensor
Reported resolution
1
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 report a fix
1
Discussions that contain suggestions
1
1 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 fix · Original poster
So, I replaced the MAF and that fixed the problem.
Leading evidence: 'Replace mass air flow sensor' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, The most frequently discussed action is 'Replace mass air flow sensor' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace mass air flow sensor', supported by resolution reports in 1 discussions. 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.
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
The car ran noticeably better (and I thought it ran great before that).
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 · Original poster
Many of you on this board recommended cleaning the MAF and replace it if cleaning didn’t help.
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 · Original poster
Many of you on this board recommended cleaning the MAF and replace it if cleaning didn’t help.
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
0 evidence records excluded for query context · 1 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
A while back, if I drove my 2001 996 Carrera rather spirited, two lights would illuminate on my dashboard: PSM Off and ABS. Many of you on this board recommended cleaning the MAF and replace it if cleaning didn’t help. So, I replaced the MAF and that fixed the problem. The car ran noticeably better (and I thought it ran great before that).
Now, I have a new (potentially related) problem. After I replaced the MAF, I cleared these codes:
P0507 - Idle Control at Startup
P1128 - Oxygen Sensing Adaptation, Idle Range, Bank 1
A couple of people suggested replacing the Fuel Pump Relay. I forget the reasoning, but it made sense. It’s also cheap (like $22) and easy, so I didn’t mind trying it. I had to order it though, the dealer was out. However, before it arrived, I took a weekend road trip (San Jose to LA, about six hours on the road). Half way there, the CEL illuminated. I had my OBD scanner with me, so I ran it and found these errors:
P0507 - Idle Control at Startup
P1128 - Oxygen Sensing Adaptation, Idle Range, Bank 1
P1130 - Oxygen Sensing Adaptation, Idle Range, Bank 2
I cleared those errors as I really didn’t want to look at the CEL my entire trip. That helped, but two days later and half way home, the CEL came on again. Once I got home, I scanned the car again and got these errors:
P0430 - Cat Conv. Efficiency, Bank 2
P0420 - Cat Conv. Efficiency, Bank 1
P1128 - Oxygen Sensing Adaptation, Idle Range, Bank 1
P1130 - Oxygen Sensing Adaptation, Idle Range, Bank 2
I picked up the Fuel Pump Relay and replaced it, cleared the codes, and that’s currently where I’m at. Not sure if the CEL will come back on or not as I just replaced it and drove around the block afterwards.
The car has been running and driving just fine, no strange sounds, smells, and no rough idling either. The CEL came on at normal highway speeds (75ish), not during idling, slow speeds, or even performance driving.
I’m wondering if anyone has any tips/advice what to do next if the Fuel Pump Relay doesn’t resolve the issue. Am I looking at Oxygen Sensors… or something else?
Have you recently done anything to contaminate the Cats? For example huge oil ingestion,AOS, High ZDDP oil, Excessively rich mixture/overfuelling, Aftermarket "Tune",problems with Fuel Pressure regulator.
Odd that both cats deteriorate simultaneously. Expensive also.Hence the questions.
Nope, the car is stock, other than the IMS fix performed by Flat Six Innovations well before I ever owned it. The person I bought it from only used the
Joe Gibbs
oil in the car that LN Engineering recommends after the IMS solution has been installed.
0507, 1128, 1130 all point to intake air leak. Common places...intake boot to throttle body not sealing, oil filler tube cracked at some out of sight places.
