rx7dan

iTrader: (1)

I'm doing a DP install and when I pulled the o2 sensor from my old pipe it looked like this...



I have not dealt with too many o2 sensors, but judging by the way it looks I'm guessing I should replace it... Does anyone know how to determine if they are bad? I would prefer not buying a new one just because, if possible...


Thanks in advance to anyone who takes the time to help!

Dan

Go48

iTrader: (7)

Download the appropriate factory service manual from the site below. There are detailed instructions for testing the O2 sensor in the Fuel and Emission Control section.
http://wright-here.net/cars/rx7/manuals.html

RotaryRocket88

iTrader: (7)

Test it per the FSM, as mentioned. There will always be deposits on an 02 sensor, so looking at it won't tell you much.

Mahjik

iTrader: (1)

I would just replace it while you are there. A Bosch replacement shouldn't be more than $30.

funkjaw

iTrader: (3)

Another possibility is going wide band if it is a reasonable option.