DTC code
P0174
System Too Lean (Bank 2)
Technical guide
Symptoms
- Rough idle
- hesitation
- check engine light
- lean running bank 2
Probable causes
- System too lean bank 2
- air leak on bank 2 side
- dirty MAF
- low fuel pressure
Diagnostic steps
- Same diagnostic as P0171 but focus on bank 2 side of engine.
- Check intake manifold gasket bank 2 side.
- Clean MAF.
- Test fuel pressure.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Ford Windstar 19
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0174
Nothing confirmed yet for this code. No guess is offered on purpose.
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