OK, if you can't pull the codes, you can test the O2 sensors with an ohm meter as follows;
Remove the sensor(s)
With the sensors at 68 degrees F, test accorss terminals +B and HT.
Ohms resistance should be 5.1 to 6.3
California models. 4.5 to 6.0
Any readings above or below these ranges, the unit is defective.
IMPORTANT NOTE; if the sensors test good and you re-install them, be SURE you coat the sensor threads with some sort of "anti-seize, or you'll never get them out again. Hope this helps
Sunday, March 8th, 2009 AT 7:33 PM