Hey Jill=They have to be removed with a scanner after '96. Auto zone can do this free. GoodluckJoe
Just had this problem today, Not sure if it will always work, but my 97 Villager had a knock sensor code and a TPS code. I disconected the battery for about 20 min. and then reconected it. I drove the vehicle for about 30 miles and then took it in for an emission test. Passed with flying colors and the OBD monitors tested fine. Again it may not work for you but it worked for me. A mechanic friend told me to do that.
If the battery was dead or disconnected all trouble codes will be erased.
Just a matter of minutes.
you can blow fuses or the battery Possible computer damage.
Disconnect the battery and wait about five minutes.
Unhook the battery for a minute to reset the PCM.
This can be done with a scan tool or by unhooking the battery for a minute.
Dead battery? Battery cables in need of cleaning or replacement?
You can purchase any brand you wish as long at it is the correct size.
With an OBD2 scan tool. Or just unhook the battery for a minute.
This indicates a no-charge situation. Most likely the alternator is bad.
Group 24R is the largest you can easily fit.
The easiest way is to unhook the battery for a minute.