I just got y/b and ms cat installed. Along with a new after cat 02.
Check engine was on I checked the code (pretty much knew what it was going to be). It was the 02. I reset the ecu and then checked the code again. 05 05 everything’s fine.

I started the car and took it for a drive and check engine starts flickering off and on and sometimes stays on.

Check the code again and still 05 05. Reset the ecu, start the car and same thing.

Any answers?

boo

 

Same thing happens to mine. It won't go off because it is triggered by increases exaust flow.

 

one idea...

1) make sure the selector **** is back in the correct position.

cheers!
FLO_BOY

 

Drove it again and light remained off!! I'm happy now!

Boo

 

It will do that and then all the sudden it will come on later. Thats the problem with modifying exaust flow.

 

You were right!

I went 3 weeks with no problems. I was going to post and tell you I have had no problems but the CEL came on again and
through a 0702. Last time was 0902. I reset the ECU and it’s gone
again. Very annoying.

From reading through posts, it seems that most High flow CATS are experiencing this problem. Does not seem to be an over threatening code and you can run with it on! I hope this is true.

boo

 

Yeah its fine. Its just cause the exaust is flowing faster so it gives a fault.

 

No.

Why do you keep saying this when it isn't true?

What is the code for "too much exhaust"? Which sensor measures it?

Please enlighten the rest of us.

 

Too much anti-sieze compound can potentially isolate the sensor from ground. A bad ground can give you errors.

I know that GM makes an electrically conductive anti-sieze.

 

When there is increased exaust flow, the sensor goes crazy for some reason. At least thats what nissan says.

 

Nissan is wrong.

 

If it comes on again, I guess I shouldn’t have any problems removing the o2 cleaning the compound and adding the GM type. Do you get the compound from a GM parts store?

I do remember it having a lot of compound in the hole but I would have no idea if it was too much. Thanks for the info.

I'll let you know what happens if I need to do this.

boo

 

If you noticed a lot of compound, you can pretty much bet that there is WAY too much. I'll get the part No. for the GM stuff at home and post it tonight. You should be able to find it at any GM dealership parts counter.

You may be able to wipe off the excess from the sensor and hole. You would probably leave enough residue to prevent seizing but still regain electrical continutiy.

 

The GM part number is 5613695. I have been told by reliable sources that this stuff is electrically conductive where conventional anti-sieze paste is not.