Did he remove the oil filler plug first? That's advised by some, although I
didn't find I needed to.
Has he been able to remove the securing pin? That's often the trickiest part
of the job.
Once the pin is out, grasping the sensor with a rag and *gently* rocking it
from side to side, whilst pulling upwards is the way to do it.
Tapping or hitting it *will* break it! Taking the time to ease it upwards
will get it out.
Best way of removing that is to use a pair of long-nosed pliers to break off
the clip that engages with the transmission. Then grip the pin close to the
transmission with a pair of side-cutters. Levering against the casting with
the side-cutters will then get the pin out bit by bit.
Obviously a new pin is needed to reassemble!
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