Oxygen sensor check ? Options

[Liam_c]

Hey everyone

I went to go back my celica in the garage last night and as I walked behind the car I got a strong smell of petrol :s

My assumption is the O2 has gone bad (as my fuel consumption has gone up slightly) as well as idle is rough sometimes.

How can I easily (and cheaply) diagnos a faulty O2 sensor ? mines a 3sfe

Thanks also no CEL has come up ... Yet lol

[Box]

The front O2 sensor that helps to regulate the air/fuel mixture won't throw a code unless it's completely dead. Something else that regulates the air/fuel mixture and won't throw a code unless it's dead is the coolant temperature sensor. Should be able to find testing procedures for both online.

Double check for fuel leaks as well. Other things that can cause running rich is a faulty fuel pressure regulator or leaking/sticking injectors. Won't hurt to try the reset procedure either.