2011 e-250-5.4 "O2 sensor not complete"
I am failing Emissions because two tests are "not ready". The O2 sensor not ready and Heated O2 sensor not ready. I've driven about 250 miles city/hwy since test and it is still tests bad. No DTC's, CEL, or drivability issues. Any clue where to look for this one?
Last edited by wa9zug; Mar 6, 2020 at 07:42 PM.
We may not all agree on this, but this is where I would start.
Confirm the oxygen sensor heater circuit is functioning.
Confirm the engine temp is reaching the operating temp
When the operating temp is reached, observe what the oxygen sensor is doing and see if it responds to my adding fuel and response when creating a large vacuum leak.
Before going any further would at least have an idea if those systems are working.
Confirm the oxygen sensor heater circuit is functioning.
Confirm the engine temp is reaching the operating temp
When the operating temp is reached, observe what the oxygen sensor is doing and see if it responds to my adding fuel and response when creating a large vacuum leak.
Before going any further would at least have an idea if those systems are working.
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