OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P016A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyO2 sensor heater aged
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor, Ect Sensor
Related codes
- P0167O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)
- P0168Fuel Temperature Too High
- P0169Incorrect Fuel Composition
- P016BClosed Loop Air/Fuel Ratio Control At Limit - System Too Rich
- P016CClosed Loop Air/Fuel Ratio Control At Limit - System Too Lean
- P016DExcessive Time To Enter Closed Loop Fuel Pressure Control
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.