UK Car Repair Questions? Ask a Mechanic for Answers ASAP
unless you have some kind of load resistor then you won't get a resistance reading between the pins
best method to test is to hook up an AC voltmeter and give the sensor a sharp 'tap' with something metallic
you should see a voltage spike on the meter
however what I would say is that these early GDi ( high pressure fuel injection into the cylinder) are very prone to coking up of the inlet manifold and EGR circuit
so I's suggest blocking off the EGR feed into the inlet to see if this helps at all
it would also be worthwhile checking fuel pressure is up to the 3bar mark with a gauge onto the injector rail
do you still need help?
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Ok that sounds like the sensor may be working, ideally you need a oscilloscope to spot the changes in voltage but if you're getting a voltage spike when its being tapped then that usually means its fine and you can trust any reading its producing as they usually work or they don't with no in between
the next thing is the why its detonating?
as its either too lean due to clogged injectors or low fuel delivery pressure
or the spark advance is too high but I don't think that there's a distributor on this engine?
or the combustion chamber is badly coked up and so raising the compression ratio of the engine
so fuel pressure check as the next step
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