Engine cut out this time

After all of the other work that was completed recently, I was really pleased with how the car was going, I started to feel satisfied that the car was actually getting back to how a Mercedes should be. Then it happened, I was in the middle of a car park, put the car in reverse and it cut out on me, and when I went to start it again, it just wouldn’t. It was very interesting however, as it was not your normal cut out, it turned over, but extremely fast over and over and over, until I took the key out of the ignition. I gave Liam a call at Huxley’s in Fleet and explained that the car was having issues again and let him hear the engine turning over, and he immediately diagnosed it to be the Crankshaft Position Sensor, which would also explain the intermittent hesitation on acceleration, and the intermittent rough idle. His advice was to let it cool down for an hour or so and then try to start it again, as the Crankshaft Position Sensor gets hot and expands, and when it’s faulty this would cause it to fail. Once it cools down, it will start fine again. So I got some help to push the car in to a parking space and left it for a couple of hours whilst I got on with my business.

After going back, the car instantly started without issue and ran as normal. I started driving home, got about 2 miles and the car cut out again, fortunately just before a lay by, so I parked it up and gave my brother a call to come and tow me home as I couldn’t be bothered to wait for it to cool down. Got the car home, and attempted to start it again, and all worked fine as it had chance to cool down, excellent…so I know what was wrong with it! Now to change it…as this is a simple job I have done on other vehicles, I made the decision to do it myself, it’s only a 10-15 minute job really!

So I shopped around for a new Crankshaft Position Sensor, and got a price from Mercedes-Benz, which come in at £122.41, or as they hold them in stock, with the Mercedes-Benz Club discount, £110.17! I continued to shop around for a price for a Bosch sensor, as Bosch make the Mercedes genuine part. My local Andrew Page, where I have a trade account come in at £59.16. Euro Car Parts was £69.99 and GSF Car Parts was £76.13, however I happened to have a discount code for GSF as they were running a 45% off all car parts promotion…which bought the price down to only £41…Bargain! So I reserved it and collected the sensor the next day. Excited to finally get this resolved.

The symptoms that I had which all add up to it being the Crankshaft Position Sensor were:

  • Intermittent hesitation when accelerating; when stationary, press accelerator pedal and nothing happens, so you press slightly harder, nothing happens again…and then it suddenly kicks in and throws you backwards.
  • Intermittent rough idling at traffic lights or junction etc. Felt like the engine was trying to stall, and then strangely cleared up.
  • Finally…engine suddenly cut out without warning when it reached just over 80 degrees.
  • After the engine started again once it had cooled down, the check engine light had illuminated.

I thought it may help those with the same issue if I do a quick and brief guide on how to replace the sensor, in case you have never done one before. It really is simple, so as long as you have the correct tools and a bit of patience, don’t be scared to do it as you can save a lot of money at a garage.

You can see the guide hereReplacing the Crankshaft Position Sensor on Mercedes CLK430.

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