not sure if the ecu can detect problems 100% of the time accurately. a few weeks back, i had code 53 (right 02 sensor) so i thought i needed to replace this. but it happened to be a bad coil pack. the 02 was fine. but it could be a slew of other issues as well...even including worn out tires/misalignment issues...
mike kim_michael@jpmorgan.com 1990 PearlGold Stage3 NA