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Several. Dirty air filter. defective CO2 sensor, needing new spark plugs, wires, and possibly cap & rotor. Worn out catalytic converter(s), or other engine control devices that aren't working properly. Due to the age of the car, check all the vacuum hoses. Replace as necessary. Some might be cracked and causing a slight vacuum leak or not connected at all.

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โˆ™ 2004-11-29 01:19:08
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Q: What could be a common cause of a 1988 Dodge Diplomat failing to pass DEQ due to excessive carbon monoxide?
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