How can I cleared service light (maint reqd )?
You have to be more specific FWD / RWD? If its the SRI u have to press a button the the SRI module, located RWD behind instrument panel, FWD behind IC below fuel gauge.
1989 DODGE RAM VAN B 250 V6 (3,9l) RWD(rear wheel drive if you mean that).I have had this vehicle allmoust 2 year and I now the lamp start shining
UPDATE the reset can only be done with scan tool i.e. DRB-2 or equivalent
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