Cold start CEL

[ChIoVnIdCa]

I get a cel whenever I start my car when it is cold and has been siting for a while. (couple hours) I get code 1 and code 21. Oxygen sensor cel and vtec Spool Solenoid Valve. If I turn the car off and start the car right after the codes go away and will not come back till I have a cold start. . Ive replaced the solenoid.

vtec and the car runs fine when I restart it to get rid of the cels

JDM h22a , chiped usdm P06 ecu, crome

[bruno8747]

Had that problem before, It has to do with the O2 Sensor heater circuit. You will need to change the o2 sensor. Cold start CEL, but will go away if you restart the car.

[ChIoVnIdCa]

Did you have the same vtec cel also?

[bruno8747]

Did you have the same vtec cel also?

Just had that problem last year with a F22A. Only did it on really cold mornings. Would go away after that until the next day. I had a bosch o2 sensor in there also. Sensor was around 4 months old.