1991 Nissan Sentra speedometer

1991 NISSAN SENTRA
4 CYL • FWD • AUTOMATIC
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ANTONIOHURTADOGOMEZ
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Speedometer reads but reads incorrectly by 20km per hour havent really looked into it much to be honest I am an automotive student and have worked at shops before but have never encountered this before if anyone has had a similar problem please let me know of some solutions I feel it would either be the cable or a faulty sensor havent investigated much so dont know if it is cable driven or electrically thank you
Sep 19, 2014 at 9:20 PM
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HMAC300
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check to see if it's cable driven first if it is pull cable out and lube it if that doesn't help get anew cable. otherwise scan for codes.
Sep 20, 2014 at 5:49 AM