royal flush

He owns a low mile 2001 corvette 6 speed--keeps getting 02 sensor codes--1133 mostly but also gets 141 and 161--he delets codes every time he starts car when cold--car runs great and the question is He never gets the Check Engine Light--this now is after 6 cold starts-Its gone thru 6 cold start cycles with the same 1133 code the cel should have lit up??-

onspeed

he should replace his O2 sensor.

royal flush

Yes but since the other 02 sensors had codes that were there and came back--likely replace all 4 sensors? makes sense to me-

royal flush

Also what doesnt make sense--is NO CEL on--