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YOUR RESEARCHHelp troubleshooting boost sensor codes (P0238 & P1136)
Leading reported evidence
Disconnect also
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Suggestion · Original poster
I cleaned up my MAP and MAP sensors and that didnt do anything to fix the situation and did a battery disconnect also with no improvement.
Help troubleshooting boost sensor codes (P0238 & P1136)
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Leading evidence: 'Disconnect also' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect also' (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.
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Suggestion · Original poster
The car has been essentially sitting for 8 months in a headed body shop garage while awaiting parts for some minor body repair work to the front bumper.
Help troubleshooting boost sensor codes (P0238 & P1136)
Replace n75 boost sensor and hopefully
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Suggestion · Original poster
am planning to replace the N75 boost sensor and hopefully that fixes it but would again welcome any other suggestions should that not fix the issue.
Help troubleshooting boost sensor codes (P0238 & P1136)
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Suggestion
If the hose connected near the throttle body is not connected the turbos run full on all the time and can overboost really quickly.
Help troubleshooting boost sensor codes (P0238 & P1136)
Use wouldnt cause the waste gates
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Suggestion · Original poster
I hope that lack of use wouldnt cause the waste gates to seize??
Help troubleshooting boost sensor codes (P0238 & P1136)
Repair work
No successful repair reported for this finding.
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Suggestion · Original poster
The car has been essentially sitting for 8 months in a headed body shop garage while awaiting parts for some minor body repair work to the front bumper.
Help troubleshooting boost sensor codes (P0238 & P1136)
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.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Outcome without a verified action link
I cleaned up my MAP and MAP sensors and that didnt do anything to fix the situation and did a battery disconnect also with no improvement.
Been getting a couple boost sensor codes recently on my stock 2004 996TT with 25k miles which dont cause a CEL but is limiting boost in 1st gear and causes very erratic boost in gears 2-3-4-5.
P0238
353 Pressure Sensor - Above Limit
P1136
Pressure sensors signal comparison charge pressure / ambient pressure - signal implausible
Done some searching and seems the boost sensor N75 is the culprit so I've ordered a new one which looks fairly straight forward to remove per this helpful DIY
https://www.6speedonline.com/forums/...rging-fix.html
Has anyone else experience these codes (i've not seen P1136 on these forurms hence the ask) and have any feedback if the boost sensor (N75) was all that you had to replace? I cleaned up my MAP and MAP sensors and that didnt do anything to fix the situation and did a battery disconnect also with no improvement.
Thanks in advance for any feedback.... am planning to replace the N75 boost sensor and hopefully that fixes it but would again welcome any other suggestions should that not fix the issue. thx
I doubt the N75 valve will fix that. I would check that the wastegates are not seized shut, and the vacuum/pressure hoses from the N75 to the wastegates are properly connected, and the N75 reference hoses are connected correctly.
The N75 has one reference hose that's attached to the Y-pipe just before the throttle body, and a second reference that's attached to the Y-pipe near the diverter valves. If the hose connected near the throttle body is not connected the turbos run full on all the time and can overboost really quickly.
Datalogs also would help, a minimum of boost setpoint, actual boost, and N75 duty cycle.
theprf - much appreciated I will start with doublechecking the N75 reference hose connections. The car has been essentially sitting for 8 months in a headed body shop garage while awaiting parts for some minor body repair work to the front bumper. I hope that lack of use wouldnt cause the waste gates to seize??
This is a source reference. Confirm exact model applicability in the original material.
