Excessive Time To Enter Closed Loop Air/Fuel Ratio Control

Check these first

• A lazy or biased oxygen sensor delaying closed loop
• An open heater circuit keeping the front O2 sensor cold
• A rich or lean condition that closed loop cannot correct
• A coolant or air temperature sensor reading wrong, holding open loop

What to do next

1. Read oxygen sensor live data for switch activity
2. Check the oxygen sensor heater circuit and fuse
3. Read coolant and intake air temperature live data
4. Check fuel trims for a mixture that blocks closed loop
5. Replace the lazy oxygen sensor if the circuits test good
6. Clear the code and retest

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