Hyundai SUV Range

My information suggests the crank-angle sensor for this engine is located on the rear of the cylinder block (near where the engine joins the transmission) near the oil filter housing. It’s usually hidden by a small heat shield and requires that and a 10mm bolt to be removed to remove the sensor.

Access to the wiring harness is usually from above, but the sensor itself is most easily removed from underneath the car after removing any relevant plastic shielding.

Because you’ve already logged the problem with your dealer, it should be on file as a pre-existing condition. Now that it has become worse, you need to take it back to the dealer and have it checked again. If the dealer won’t look at it for you, you need to do two things. First, have the vehicle independently assessed by a transmission specialist. Secondly, you should take the matter to Hyundai’s Australian customer service division.

The symptoms you’ve described are consistent with problems far too commonly found in dual-clutch transmissions. Shuddering and slow gear selection are far from unknown in this make and model, and Hyundai even had a software update to try to alleviate these problems. At the very least, the dealer could try the new software, but if left unchecked you could end up with a dead transmission that could cost many thousands to replace. So it’s crucial to keep the dealer and Hyundai Australia in the loop to maintain your warranty cover.

What you need to do is work backwards and check every connection and wiring plug that is anywhere near where you were working. A single unplugged (or even loose) sensor, connection or fitting can absolutely sideline a modern, electronically controlled engine.

You may also find you’ve damaged a sensor in the process of cleaning it (they’re pretty sensitive things) so a scan of the car may reveal that.

Also, was the cleaning process initiated by an existing problem that made you think the sensors needed cleaning? Cleaning an already dud sensor rarely brings it back to life.