Powertrain
generic / SAE
P016B
Closed Loop Air/Fuel Ratio Control At Limit - System Too Rich
Closed-loop fuel trim hit its lean correction limit because mixture is structurally too rich. Likely fuel pressure too high, leaking injector, or O2 sensor reporting too lean.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 6B
Possible causes
- Injector leaking high
Symptoms
- Check engine light on
- Increased fuel consumption
- Black smoke from exhaust on acceleration
- Smell of unburned fuel, fouled spark plugs
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–2000 €
- Estimated time: 1–6 h
- Component: fuel pressure regulator
- Component: fuel injectors
- Component: oxygen sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012