EVAP and O iM Sensor Not Ready

ROGUESS

MEMBER
2010 CHEVROLET CAMARO
10,250 MILES

I threw a code 350 miles ago due to a loose hose. The code was immediately reset and I drove approximately 150 miles before going for my emissions. When I went in the Evap And O sensors were not ready.

Since then I have driven the GM Drive Cycle I've found online. Driven the car normally and driven it at 55 MPH for 40 miles straight, 3 times what the dealership said they do to get the sensors to go ready and they still are showing not ready.

Any advice on how to get these two sensors to go ready would be greatly appreciated as it seems even the dealership doesn't know.

It's. 2SS with the 6.2L LS3 engine, manual transmission. Only changes are a cold air intake and GM axel back exhaust.

5 Replies

HMAC300

MECHANIC
48,601 POSTS

What were the codes? Some of these need to be driven 100 miles also the cold air intakes can an dwill effect obd II. If you are trying to get it to pass emmisions then make sure to change oil and filter first to get all the fuel out of the oil. The exaust that you have may be not letting the O2 sensor heat up enough, sounds crewy but i've seen stranger things.

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Wednesday, May 2nd, 2012 AT 7:21 PM

ROGUESS

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3 POSTS

It was just a lean fuel code, the intake had come loose thus causing the code. It's been almost 300 miles since the codes were cleared.

The exhaust isn't the problem, it's a factory option on the car.

Passing emissions isn't the issue, it's getting the IM ready monitors to run their diagnostics and change from not ready to ready (And the oil has been recently changed. )

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Wednesday, May 2nd, 2012 AT 7:27 PM

HMAC300

MECHANIC
48,601 POSTS

Has anyone used a tech 2 to try to reset the codes? Or was it a regular auto parts one. It hink this has to be reset by a tecch 2 and not an auto parts store one. If this has been reprogrammed by one of the things like bully dog or similar that may be your problem.

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Wednesday, May 2nd, 2012 AT 7:44 PM

ROGUESS

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3 POSTS

Hasn't been tuned and it was cleared properly.

The code isn't the problem. It's the IM monitor status. The other 6 have reset. It's just the O and Evap which will not go ready (thus the CEL has been properly cleared or none of the monitors would be ready)

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Wednesday, May 2nd, 2012 AT 8:03 PM

HMAC300

MECHANIC
48,601 POSTS

In order for the im monitor to reset it has to have all the clodes cleared. Which i'm sure you are aware of. About the only thing I can say is to check your grounds, or for burnt damaged wires by o2 sensors and mayb e try another gas cap or make sure your is tight, like at least 3 clicks after tightening. I can't think of anythign else without seeing this.