Powertrain
generic / SAE
P016C
Closed Loop Air/Fuel Ratio Control At Limit - System Too Lean
Closed-loop fuel trim hit its rich correction limit because mixture is structurally too lean. Likely vacuum leak, low fuel pressure, or contaminated MAF.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 6C
Possible causes
- Vacuum leak high
Symptoms
- Check engine light on
- Rough idle, possible stalling
- Hesitation or hard cold start
- Power loss under load
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 50–1500 €
- Estimated time: 0.5–5 h
- Component: intake system
- Component: fuel pressure regulator
- Component: mass air flow sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012