Hey my car had a SES light on so i went to auto zone to get it checked and it was a p1133. Definition bbho2s-11 insufficient switching.

Can any one help me on how i should go about this problem.

oh its a 96 z28 btw

 

Possible problem with the pre-cat oxygen sensor on the driver's side. Could also be O2 harness problem.

 

Slow switching of an O2 sensor is usually caused by the sensor itself, typically due to contamination.

 

I had the same code a while back with BRAND NEW acdelco o2 sensors. The code can also be cause by an exhaust leak. I had a small leak because the band clamp on the header collector wasnt tight enough and the sensors itself were also loose.

After I tightened everything up, it went away.

 

I do see a pretty big hole right before the muffler. But its been there for a while and it hasnt thrown a code. Could this be the problem still?

 

Exhaust leaks AFTER the sensor will no affect it, and will not "throw" a code. Exhaust leaks before the sensor can cause a "false" lean condition. Not sure why that would cause slow switching, though.

 

ok so it can either be an exhaust leak before the sensor or the sensor itself?

 

Yes. I have 2 almost new Delco O2's if you need them. $30 shipped for both. My car was tuned in open loop so I no longer have any type of oxygen sensor any longer

 

alrite sounds good but first i want to check if its an exhaust leak. How do i do this should i just bring it to meineke?

 

Make sure the sensors are tight in the bung, but really if you are running stok manifolds and y then it shouldnt leak if in good shape. If running aftermarket, take a look near the slip fit connecion and make sure all is tight

 

alrite thanks alot

 

alrite so i just got back from meineke and there are no exhuast leaks. Threehonks where are you located b.c i want those sensors but i leave for school on friday.