95 Dakota 3.9v6 how do you test the EGR system?
failed smog in Ca. NO[PPM] 15mph max 508 meas 611 25mph max 533 meas 699 exhaust & cat are good o2 sensor new what else can I check ?
have someone check the computer codes, not with a cheapy code reader, but with one that can read drive cycle monitors. it might get you closer to an answer.
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