Went to Autozone, borrowed the OBDII scanner, came up with 3 codes... P0135 (Bank 1 Sensor 1), P0141 (Bank 1 Sensor 2), and P0155 (Bank 2 Sensor 1). I went to a mechanic and he said it could either be the o2 sensors or the catalytic converter. Is this accurate???? Or is it just the o2 sensors??? I'm guessing it's just the o2 sensors, but I could be wrong.

Thanks.

P.S. When I start the car, it smells horrible... I'm guessing it's because it's running rich??? Also, I'm getting worse gas mileage.

 

Just try to do a tune up and pour Injection cleaner in your tank

 

injector cleaner doesn't help our type of fuel injectors... and in no way would help his o2 sensors