Mixture Control Codes 29E0 and 29E1

Hi All,



I'm observing these codes from time to time, even after I clear them they do not come back right away. Does anyone know what might be causing it? Or how to go about troubleshooting?



My injectors and spark plugs were just changed a month ago. I've seen these codes even before those changes.



On my BT scanner it reads:

29E0

29E0 Fuel Mixture control

Error will cause a warning light

Error is not currently present

Test conditions have been completed

Timeout



Odometer 60954 miles

speed 1536.00 rpm

suction pipe pressure 90 kPa

relative load 0.00%

matching throttle valve model (factor) 0.64



29E1

29E1 Fuel Mixture control

Error will cause a warning light

Error is not currently present

Test conditions have been completed

Timeout



Odometer 60954 miles

speed 1536.00 rpm

suction pipe pressure 90 kPa

relative load 0.00%

matching throttle valve model (factor) 0.63