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940 cannot clear obd codes, rex regina, stumped 900 1994

posted by  bcg on  Thu May 23 11:45 CST 2013
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last visit: Sun Jul 27 08:12 CST 2014
[RELATED]


all,
need some help on this silly rex regina system.

i have a 94 940 rex regina. i have 3 codes but i cannot clear them from socket 2. the engine light has gone off, but the codes remain.
i can't remember the 3 codes but they are for
1. low/ high battery voltage
2. iac (runs fine, but code triggered)
3. air temp sensor (car dies when disconnected)

i set the ignition key and disconnected the battery and i tried deleting them throught the obd box. it has always worked before, but now they are not removed.

the car runs fine, and i'm sure i don't need to replace anything. no other codes in socket 6.

i haven't had time to drive the car to see if the engine light will come back on, but i think it will.

i've read previous posts, but i'm still baffled. bad icu? i had something similar in 2009. at that time car failed inspection, nox. i replaced the cat and o2 sensor and passed since.

side note, i have no idea why volvo went to this system other than to make more money off of their loyal clientele.

thanks again,
byron golden
86 245
92 245
94 940






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