Code
P1128
VW / Audi fuel trim
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Most likely causes
- تسرب هواء
- MAF متسخ
Symptoms you may notice
- Check engine light
- Rough idle
- Poor economy
Checks to run
- Smoke-test the intake
- Clean the MAF
- Check fuel pressure
Tools you may need
Smoke machine
MAF cleaner
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.