I am pretty sure those were the 2 codes that came up....

I just got a A4 and have no prior history of CEL being on or off... The bulb was bad... So I replaced the bulb and there was no light on... for about a 30 mile drive...

I then did a thorough Seafoam treatment in the gas, oil and vacuum....

Changed the oil and the plugs.... Whole time no CEL.....

About 20 miles later after all this was done it came on with the 2 O2 sensor codes, I believe left and right (1996 2.8L)

I know seafoam can possible trigger CEL, but do you think it would do it not until 20 miles later after it has all burned off?

I can just disconnect negetive terminal to reset the light?

Advice would be great.

 

you have a bank 1 sensor 1 and bank 2 sensor 2 which means your passenger side if the front one and the driver's side is the rear one. just take out all 4 and clean them with intake cleaner. how's your gas mileage?

 

you have a bank 1 sensor 1 and bank 2 sensor 2 which means your passenger side if the front one and the driver's side is the rear one. just take out all 4 and clean them with intake cleaner. how's your gas mileage?