Hi
First post here, hoping to get some advice on a strange and annoying issue I've got on my wife's polo.
Background of the issue first, car was fine but then developed rough idling and sometimes struggled to start. I plugged a code reader into the OBDII port and got a P0322 code (current & pending), Ignition/Distributor Engine Speed Input Circuit No Signal. After looking into it, it seemed highly likely it was the Crankshaft Sensor that was the issue so I replaced this with a new Bosch sensor from ECP, but the problems still exist. The car does start and run however the rev counter doesn't work and the code comes straight back if cleared whilst running. The engine code is BBY and I'm confident I got the right sensor.
With the ignition on I have tested voltages between pins 1 & 3, which results in 3.0v, I have also tested the voltage on the signalling pin but that reads 2.9v regardless of whether the engine is being cranked or not. From everything I've read, this isn't the desired behaviour.
I can't find any further information, clues etc online and am rather at my wits end now. If anyone can point me in the right direction, it would be hugely appreciated.
Many thanks