Hello,
my brand new ford ka 1.2 zetec crankshaft sensor has failed(diagnosed after engine management light came on). Ive only done around 200 miles and the mpg is rubbish bout 30mpg could this be linked?? Regards

The fastest way to check the crank and/or camshaft sensors on a 1995 or newer vehicle with OBD II is to plug in your scan tool and check for any fault codes.

P0335....Crankshaft Position Sensor A Circuit

P0336....Crankshaft Position Sensor A Circuit Range/Performance

P0337....Crankshaft Position Sensor A Circuit Low Input

P0338....Crankshaft Position Sensor A Circuit High Input

P0339....Crankshaft Position Sensor A Circuit Intermittent

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

P0341 Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 1)

P0342....Camshaft Position Sensor 'A' Circuit Low Input (Bank 1)

P0343....Camshaft Position Sensor 'A' Circuit High Input (Bank 1)

P0344....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 1)

P0345....Camshaft Position Sensor 'A' Circuit (Bank 2)

P0346....Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 2)

P0347....Camshaft Position Sensor 'A' Circuit Low Input (Bank 2)

P0348....Camshaft Position Sensor 'A' Circuit High Input (Bank 2)

P0349....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 2)

You can also use your scan tool to check for the presence of a cranking rpm signal if an engine is cranking but is not starting because there is no spark (which is often a clue that the crankshaft position sensor is not working).

On pre-OBD II vehicles, you can use a scan tool to check for codes, or use a manual flash code procedure to read out codes. On a pre-OBD II GM application, a trouble Code 12 while cranking would indicate no reference signal being generated. On pre-OBD II Ford applications, a Code 14 would indicate a problem with the crank position sensor signal, which Ford calls a "PIP" (Profile Ignition Pick-up) signal.

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