Judge01uk

Solved!.. So happy 😁 The OEM sensor never made a difference, it was not the crankshaft sensor at all but loose wires on an electronic water pump at the front of the car, it shares the same earth as the crankshaft sensor, it was probably moved a bit with each oil change and the wires were bare and touching, once the car was up to high temperature it went into limp mode as the pump kicked in, the best diagnostics garage in the area (usually 3 weeks wait) found it straight away..

After taking it back to them in limp mode, they said it's definitely the crankshaft sensor, we will try next week an OEM VW sensor as the one fitted was an aftermarket Delphi one, has anyone else had experience of cheaper aftermarket sensors not working correctly on these newer VAG TDI engines?

Update: diagnostics did not show up anything, they also drove 8 miles and it did not happen with them, said there is nothing wrong with the car.. Since then we have changed from an oiled K & N air filter to a standard paper filter and changed the MAF sensor as I had read the oil from these filters can cause electrical problems in the MAF. When I test drive it (usually more than 8 miles) it drives very nicely but then it still happens usually during an overtaking move for example, jerky hesitation then limp mode and ESC system inactive and tyre pressure loss detected. What I have noticed is if you turn the ignition off and on again, the limp mode disappears, and so do the error codes!? only the esc warning and tyre pressure warnings stay until the car is stopped and key taken out.. I think next I will drive it to the diagnostics place in limp mode and keep the engine running while they test it..

Good day Crasher, It is good to know I am not the only one having such problems, I am sure all that work on the Polo cost a lot of money, yes the wires from crankshaft sensor to ECU were tested, it might be the ECU that needs replacement with me too 😕 I should also say that the car was tuned to stage 1 over a year ago and been great to drive until now, and I do around 1000 miles a week as a Taxi driver. Hoping the full VW diagnostics next week will find the real problem, I will update on here, cheers!

Hi Aperture S, Thanks for your input, the O2 sensor was a separate issue that needed doing for a while anyway as it was giving fault codes after driving through large puddles, when they took out the old one it had bare wires exposed. Yes the fault codes could be a red herring, but maybe it is a process of elimination? And an expensive one.. I don't think the cam/crank sensors were tested just replaced, the wiring from ECU to crank sensor were tested last week and no faults found, that mechanic said he was 90% sure the crank ring needed replacing (is that the same as the pick up ring?) So gear box out and they did that and said no visible damage, but the problem is still there.. We are sure the timing is correct. Next week hopefully I will get the car into a full VW diagnostics place and find the true problem. I will update on here thanks for the advice..

Yes Crasher a new crank oil seal was fitted when timing done a few weeks ago.. Today we have also had the gear box out and done the crank ring using a special VW tool, when test driven jerky hesitation, limp mode and the error P0322 came back, I am loosing my will to live, any more advise please?

My mechanic fitted a new crankshaft sensor (no need to take out the gear box ;-) and sorted out the electronic water pump C problem, but the original symptoms posted above keep happening:- intermittent jerky hesitation when accelerating, goes into limp mode, code P0322 (crankshaft sensor) traction control and loss of tyre pressure dashboard warnings, cruise and parking sensors don't work either, when you stop and take out the key and start again all cleared.. Next he will change the heated O2 sensor as that fault code has popped up a couple of times especially after wet weather. Any thoughts Crasher? Anyone? Thanks.

Keep getting these 2 faults together any ideas guys??

Hi Crasher, yes it was done with timing belt and water pump a few weeks before the problems started.. The clutch and DMF have been done a few days before this started.. Now getting P26F4 which means Coolant Pump 'C' Control Circuit/Open has been detected. Cleared that 3 times today already.. What do you think? And thanks for your help 👍👍

More codes today..

Hi all, I'm new here, been having a problem with my Octavia 170,000 miles, a new clutch and DMF flywheel were recently fitted, the problem seems to start with hesitation especially in 4th gear above 2500 rpm then not long after it goes into limp mode, traction control fault and finally loss of tyre pressure (usually parking sensors and cruise don't work either) when I turn the ignition on and off while moving the limp mode goes away but the other problems stay until I stop and take out the key, the code that keeps coming back is P0322 and 04087, my mechanic thinks the problem is the crankshaft speed sensor, and thinks he may have to take out the gear box to get to it. Any help greatly appreciated thanks.