Question about 2002 Pontiac Sunfire
It can be expensive to replace both, so try to find out the specific sensor by getting the OBD II code using a code reader and looking it up on obd-codes.com. when you get the info on what the code means, this is how to translate it...
the code will say something like "bank 1 sensor 1" or "bank 2 sensor 2".
Bank one is usually the sensor(s) before the cat converter, and bank two is usually the ones after the converter.
be sure you spend the money on an oem sensor and not a universal sensor. the universal sensors are ones that you have to wire up to the harness directly, and oem sensors are just put in and plug in.
and another little tid bit of advice- O2 sensors are usually rusted into place, so have some penetrating oil when you do it, I suggest PB Blaster or JB 80. you may also need to heat up the threaded "bung" that the o2 sensor is in with an oxy/acetelyene or a propane/oxygen torch to get it to turn for you.
Have patience, and you'll be able to do it yourself.
Posted on Jan 24, 2009
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