Code
P1237
VW fuel injection
Fuel injector cylinder 2 open circuit
The cylinder 2 injector circuit is open (VW).
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Most likely causes
- Faulty injector
- Wiring or connector fault
- ECM driver
Symptoms you may notice
- Misfire on cylinder 2
- Rough idle
- Check engine light
Checks to run
- Test injector resistance
- Check wiring
- Swap injector
Tools you may need
Multimeter
Noid light
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.