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93 940 w/ Regina keeps tripping Check Engine light for knock sensor code 143 900

posted by  ippo on  Sat Jul 17 15:07 CST 2010
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last visit: Wed May 30 23:36 CST 2012
[RELATED]

My daughter's 1993 940 Non-turbo has the dreaded code 143 for "knock sensor signal absent or faulty." After clearing the code the light comes back on within two days. Checked the normal items listed here to no avail. Replaced the knock sensor with a new one from FCP Groton. Torqued the sensor bolt to 8 lb-ft with blue locktite. Cleaned the knock sensor connector with Deoxit. Pulled all the engine wire harness connectors at the firewall on the driver and passenger sides and cleaned with Deoxit. Keeps tripping code 143 ever couple of days.

Considering relocating the knock sensor wire harness away from the alternator wire harness but is this really a possible solution?

I think this explains why the previous owner pulled the check engine bulb from the dash.

Thanks for any advice.

Rob Ippolito
93 940 Volvo
90 740 Volvo GL Wagon






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