Nickvet

I did the Watkins Glen event this past week, and threw a CEL on the second day. Then the car began idling rough at times - but ran great at speed for the most part - except some rare engine stuttering which is hard to describe but sounded like misfiring. It only occured twice. I do have headers.

So today I ran the codes:

P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1)
P0050 HO2S Heater Control Circuit (Bank 2 Sensor 1)
P0053 HO2S Heater Resistance (Bank 1, Sensor 1)
P0059 HO2S Heater Resistance (Bank 2, Sensor 1)
P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

Then after an extensive search of the forum I checked the fuse for the O2 sensors and it was blown. I checked the 4 sensors from under the car as well as the harnesses/wires and they looked OK.

So what I'm wondering is why did the fuse blow - anyone have any ideas?

BTW, the track was fun, the staff and my instructor were great, and my car did very well.

CGZO6

I had a CEL and the Bank 1 Low Efficiency code a few times, always showed up a few days after track event. Dealership updated the software to allow a wider range of acceptable values (GM Update). But, sounds like all your codes might have been caused by the blown fuse.

I'd let the dealer check it out.

And I've had the "Miss" on the track as well, always under acceleration. Think it's probably traction control kicking in a little. Happened alot with Invos, not so much with R6s.

Nickvet

Someone else at the track said that too.