Code
P1136
VW / Audi fuel trim
Long-term fuel trim bank 1 too lean (also Renault/Nissan)
Long-term adaptation shows bank 1 too lean.
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Most likely causes
- Vacuum leak
- Faulty MAF
- Weak fuel pump
- Dirty injectors
Symptoms you may notice
- Check engine light
- Rough idle
- Hesitation
Checks to run
- Smoke-test the intake
- Test MAF live data
- Check fuel pressure
Tools you may need
Smoke machine
Fuel pressure gauge
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.