Bad knock sensor?

[Eyvind Spangen]

I just bought a '87 100T (5kT for you US guys) very cheap. It's not
working correctly - when the engine is warm, the ignition control lamp
will light up whenever the engine is over about 3000 rpm and I
accelerate some. I get a code 2142 for bad knock sensor. The connector
looks OK, so I guess the sensor is bad. I've got a new (used) knock
sensor here, but is there anything more I should check about this
problem?

--
MVH
Eyvind Spangen