P016A
Excessive Time To Enter Closed Loop Air/Fuel Ratio Control
ECU took longer than allowed to enter closed-loop air/fuel ratio control. Most often O2 sensor heater aging or coolant temperature reading wrong.
ECU took longer than allowed to enter closed-loop air/fuel ratio control. Most often O2 sensor heater aging or coolant temperature reading wrong.
Common causes
- high
O2 sensor heater aged
One of the most commonly reported causes for this code — check this first.
Typical part cost: $70-440
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P016A mean?
P016A means "Excessive Time To Enter Closed Loop Air/Fuel Ratio Control". It is a generic OBD-II code that points to a fault in the fuel & air metering.
What are the most common causes of P016A?
o2 sensor heater aged — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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