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Crankshaft Sensor Position Replacement


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I want to post this thread because I recently came to this site as a new member, hoping to have found the answer I was looking for to my own Ford problem, but without success.

There were many similar threads and I take my hats off to those Ford owners who made the effort to post some help and advice for others. However, I hope that my specific thread will be of help to those drivers with the same model Ford as mine.

I own a 2005/55 plate Ford Focus 1.6 VTC Petrol 2 Door, of which I am extremely proud. Two weeks ago I had her serviced, ...which brings me on to the subsequent issue I had.

3 days after the car was serviced, the Crankshaft Position Sensor failed and my mechanic was not available to do the job due to being on hols. I had been told that it wasn't a big job and to try and do it myself. I turned to this sight for help, but none of the threads applied to the year and model of my Focus.

The good news is, the job has now been done....by me, and I want to share with other Focus owners my experience in replacing the sensor. I did buy the Haynes manual to assist me with locating the sensor (I have limited mechanical knowledge), but moreover I want to share with others how I did the job and what issues I had to overcome.

Firstly, to do this job you will need a new sensor (obviously), a small torch, a good strong trolley jack, an axel stand (safety first), a socket set and an 8mm socket. However, as I later explain some of the issues I experienced, I would also suggest having a swivel head socket, or a short shaft 8mm spanner.

Next, to locate the sensor on this model, jack up the car using the jacking point just below the driver's door, as the sensor is positioned just left of centre at the base of the block, and after putting a suitable axel stand in position lower the car onto the axel stand for stability. I would also leave the trolley jack in place for added safety.

From the front of the car, poisition yourself underneath and look for the oil filter. From the oil filter look up to the crank casing (approx 4-5inch upwards) and you will find a blue coloured electrical connector block sitting slightly inwards in the crack case. This is the sensor connection, and you will need to remove the connector block before you attempt to dismantle the sensor from the crankshaft. To disconnect this, on the connector block you will see a very fine spring wire...press this inwards towards the crank case to unlock the block and slip off the connector.

With the connector removed you will now be able to clearly see the 8mm bolt head that connects the sensor to the crankshaft. This is where a swivel head socket or a short shaft 8mm spanner may be useful, because as the crankshaft case comes accross the back of the sensor, on this Focus model the crank case bevels outwards, thus limiting the room you have to put the socket with ratchet handle headlong onto the bolt.

An extension on the socket head would have helped me, but because this sends the socket handle backwards, the turning of the socket is then limited by the oil filter. The easisest way would have been with a short shaft 8mm spanner, as this would have slipped neatly onto the bolt, but I didn't have one of these, and the longer handle spanner I had was limited in turning by one of the water hoses running off the base of the engine. If you only have a fixed ratchet handle then you will have to be prepared for alot of short bolt turns because of the limited room to turn it.

Once you have loosened the bolt enough, you can get your fingers in and turn it by hand until it is completely out. Now the sensor is free for removel....take hold of it and slide it backwards, out of the Crankshaft and compare it with the new one to double check you have the correct one for replacement. Now you can fit the new one. Carefully slide the sensor into the crankshaft, being careful not to knock or drop it, as this is a 'one time fit' part. As you slide the new sensor into place, be sure to align the bolt head connector up with the thread hole. Use a torch to try and see that it is in line before offering up the connecting bolt. Gently rubbing some fine grease or WD40 onto the connector bolt will help with lubrication. Offer up the connecting bolt and slowly turn it into place by hand as far as you can go. Now revert to finishing off the tightening with the ratchet/spanner, depending on what best suits you. Tighten it up until the socket or spanner won't move without forcing it, but be careful not to over-tighten. Finally, slide the connector block back onto the head of the new sensore and you are done.

Jack the car back up off the axel stand, remove the axel stand, and then lower the car back down off the jack.

I am hoping to post some photos to this thread as soon as I can find my camera cable to connect to my laptop, but I can honestly say that for a novice mechanic, this job is more fiddly than difficult. I hope this helps someone else, and good luck with any general running repairs that you may have.

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  • 4 months later...

Hi im looking to replace my crank position sensor im just not sure where its located i have a mk2 focus 1.6 petrol...do you have and pics...cheers

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Hi Pol...sorry, I don't have any pics. All I can advise is to approach the underside from the front driver side, jack the car right up as that makes it so much easier for your arms to get access in a confined space. As you slide yourself under the car try to locate the oil filter, and directly up from there (about 5 inches or so) you will see the blue connector fitted to the bottom of the crank shaft. It slips off easily enough. You will need an 8mm socket and it will be best if it is fitted with a swivel head. There is very little room to fit screwdrivers and sockets onto the socket head otherwise. I hope this helps and I am sorry I can't help anymore.

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cheers Andrew will have a look tomorrow...going to change it as i have been having intermittent starting problem for last few months...

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  • 5 months later...

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