5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP0446, P1128, And P1130 Error Codes
Leading reported evidence
Clean thottle body and maf
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
Oh and I have already cleaned the thottle body and MAF......
Leading evidence: 'Clean thottle body and maf' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check codes' (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.
Performed · outcome unconfirmed
I got the same codes right after I installed a K&N Cold Air Intake.
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 used MAF cleaner on the sensor and it poped back 2 days later so i used Throtlebody/carb cleaner and made sure not to get any on the harness conection side and it took care of thoes two issues.
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 used MAF cleaner on the sensor and it poped back 2 days later so i used Throtlebody/carb cleaner and made sure not to get any on the harness conection side and it took care of thoes two issues.
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
Just check the codes for you and 1128-1130 are indeed related to the oxygen sensor.
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 used MAF cleaner on the sensor and it poped back 2 days later so i used Throtlebody/carb cleaner and made sure not to get any on the harness conection side and it took care of thoes two issues.
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 used MAF cleaner on the sensor and it poped back 2 days later so i used Throtlebody/carb cleaner and made sure not to get any on the harness conection side and it took care of thoes two issues.
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.
5 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: 20261027T031046Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi, a couple weeks ago I reported that I had trouble starting my 1999 996 C4 (102,000 miles). The car would crank but would not turn over. It would only start if I pressed the gas pedal down. This does not have everytime I start the car. I would say 1/10 times. I was advise that I could have a block fuel injectors so I had the fuel system cleaning done. The car was fine for a couple of days and then it returned.... I did not get an codes during this time....
Just now, I got the following three codes:
P0446
P1128
P1130
I have read the post regarding these and was wondering if their is a connection? Is it time to take the car to the dealer and let them figure it out? Could a block fuel line cause these codes?
Thanks for the help....
Oh and I have already cleaned the thottle body and MAF......
p1128 and p1130 have to do with the MAF... I got the same codes right after I installed a K&N Cold Air Intake. I used MAF cleaner on the sensor and it poped back 2 days later so i used Throtlebody/carb cleaner and made sure not to get any on the harness conection side and it took care of thoes two issues.
P0446 i have no idea about.
P0446 is Carbon Canister Shutoff Valve Operation.
As indicated by Todd on Renntech (strongly suggest registering there for this type of question). P0446 indicates that there is a problem with the activated charcoal filter / tank vent system. This is causing the mixture problems leading to the P1128 and P1130 codes. Possible causes for the 0446 code include:
- Purge air line plugged
- Tank vent stuck in the open state (vacuum continuously enters the tank system from the intake pipe)
- Activated charcoal filter shutoff valve is plugged/stuck in closed state
- Flow resistance of the activated charcoal filter is too high (filter deformed/plugged)
- Pressure sensor closes incorrectly (polarity reversal)
The factory manuals have a diagnosis procedure to determine and remedy the cause.
-Todd
Just check the codes for you and 1128-1130 are indeed related to the oxygen sensor. I am not sure about the P0446 but I am sure other will chime in to help you out...
- P0446 is "EVAP Canister Shutoff Valve (Function) - Below Lower Limit"
- 1128 is "Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold"
- 1130 is "Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold
This is a source reference. Confirm exact model applicability in the original material.
