1999 plymount grand voyager service engine soon

Oil needs changed or a problem with the emissions control system. Most auto parts stores reset check engine lights free of charge

Service engine soon light has nothing to do with the oil. It indicates that you have a problem in the electronics that control the engine and or the emission control system. You must get the system tested with a tool called a scanner to see what fault code was stored when the SES light was turned on. Please read your owners manual.

the free way Simply disconnect your battery, turn on the headlight switch for about five to ten minutes, and re-connect the battery. This is pretty simple, but will likely result in you losing your radio presets and perhaps some other small things like that. or take it to someone Most if not all scan tools have an option to clear or reset codes without the use of any tools or touching the battery. Consult your tool's manual for information on how to do it with your particular model.

your local auto parts store can look that up for you.

I believe you mean won't come on. check the fuse first if that doesnt' work the head light switch

You need to get the engine serviced, plain as sight. it could also be a small problem too. Hope this helps!?

Please rate solution - Thanks.

Don't know how handy you may be but would seriously consider removing instrument cluster, and checking solder on circuit board. Just did mine, wasn't hard, maybe a couple of hours work. Nice small, pointed solder gun will be needed as well. They have had many weird problems with gauges, starting, running etc, all narrowed down to that printed circuit board, where the solder on the contact pins become corroded or cracked and cause some pretty weird stuff. At the very least, try removing dash enough to remove 4 screws holding cluster in, and pulling off connectors and putting them back on a couple of times, just in case it's just a dirty connection. If you decide you want to try it, and need more specific instructions, let me know, or even google , Dodge or Plymouth instrument cluster soldering, as there is some pictures and videos out there on the subject. Good Luck, and let me know how you make out.

WHY DO YOU THINK IT NEEDS TO BE REPLACED THIS IS MONITORED BY PCM AND SHOULD SET SPECIFIC CODE IF SOMETHING IS WRONG DO YOU HAVE SERVICE ENGINE SOON LIGHT ON OR CHECK ENGINE LIGHT ON

Transmission needs service, most likely filter change ASAP

You will need to have the vehicles computer scanned to find the problem.