oxygen sensor question

[HotZ28]

Originally Posted by tblake

Don't worry about it. To my knowledge, topping off your gas will not cause a P0420 to trip. Maybe other emissions DTC's but not a P0420, so I doubt that is your problem. I always top mine off to the next 1.00 and have never had an issue.

My Grandma Kelly had the same problem with a PO420 and she was running gas out the fill tube!

[tblake]

Originally Posted by HotZ28

My Grandma Kelly had the same problem with a PO420 and she was running gas out the fill tube!

HaHa Yeah! It'll happen!

[wafrederick]

It is true,topping the gas off wil set this code off.I know a retired Vetronix rep that even said this and you cannot outsmart him.

['97ventureowner]

Originally Posted by wafrederick

It is true,topping the gas off wil set this code off.I know a retired Vetronix rep that even said this and you cannot outsmart him.

Can you ever form an original thought without involving a member of your family, your neighborhood, or any rep??

[tblake]

I'm pretty sure the only thing that topping your tank off to the extreme can do is flood your charcoal canister full of raw fuel which could trip an emissions DTC, but it will not be P0420. In my years of working on cars, P0420 was 9 times out of 10 caused by a bad cat converter. However the exhaust system should be checked for leaks, and the rear O2 sensor data watched on a live stream to make sure it still is fluctuating before a cat converter is replaced.

[BNaylor]

Originally Posted by HotZ28

My Grandma Kelly had the same problem with a PO420 and she was running gas out the fill tube!

Such sarcasm.

Tom, time to pull the trigger.