P016B
Closed Loop Air/Fuel Ratio Control At Limit - System Too Rich
P016B is an OBD-II diagnostic trouble code meaning: Closed Loop Air/Fuel Ratio Control At Limit - System Too Rich. Common causes: malfunction of oxygen sensors, fuel leakage through injectors. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Black smoke from the exhaust pipe
- Unstable engine idling
Causes
- Malfunction of oxygen sensors
- Fuel leakage through injectors
- Increased pressure in the fuel rail
- Dirty or faulty air flow sensor
- EVAP system malfunction
- Mechanical engine problems (piston group wear)
How to Fix
- Check oxygen sensor readings using a scanner
- Check fuel injectors for leaks
- Measure the pressure in the fuel rail
- Check the condition and readings of the mass air flow sensor
- Check the EVAP system for leaks
- If necessary, replace faulty components
Related codes
Error P016B by Vehicle Brand
FAQ
What does the P016B code mean?
P016B is an OBD-II diagnostic trouble code that indicates: Closed Loop Air/Fuel Ratio Control At Limit - System Too Rich
What causes a P016B error code?
The most common causes of P016B include: Malfunction of oxygen sensors; Fuel leakage through injectors; Increased pressure in the fuel rail; Dirty or faulty air flow sensor.
How do I fix a P016B diagnostic trouble code?
To fix P016B: Check oxygen sensor readings using a scanner. Check fuel injectors for leaks. Measure the pressure in the fuel rail. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P016B?
Limited driving only, diagnose soon
How much does it cost to fix P016B?
The estimated repair cost for P016B is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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