Two weeks ago I had the mechtronic unit and battery replaced on the car. They advised that a number of modules were updated at the same time to current software versions. Since getting the car back I constantly pings up with warning showing Error, stop start unavailable, Park pilot unavailable, dynamic lights unavailable, front assist unavailable, hill start unavailable to name a few. Oddly it also effects the satnav, regardless if in using Google maps through Android auto or the factor satnav your current location bounces all over the place. The car has been back to skoda twice now and they say they can find no fault despite me showing the technician the fault in person as if was having a fit when I arrived with the car. Where do I go from here or can anyone suggest what the fault could be?

2018 Skoda Superb Sportsline + Diesel with DSG

Cheers in advance.

Edited 8 July, 20258 Jul by Shanew
Added car details

They sound like the faults normally associated with a battery swap. I believe first thing to do is turn steering to full lock in both directions and then take a drive. That will often reset the warning lights.

I'd like to think that Skoda would know that though.

Thanks for the reply. I'll give it a go.

They confirmed in the health check that the battery was showing as calibrated and in good health. Then again, when the mechtronic unit was done they did a health check and everything was fine but on the one they have just done they are advising the rear shocks are leaking, the CV boots are perished and the bushes on the bottom arms are work so I really have no confidence in them.

1 minute ago, Shanew said:

Thanks for the reply. I'll give it a go.

They confirmed in the health check that the battery was showing as calibrated and in good health. Then again, when the mechtronic unit was done they did a health check and everything was fine but on the one they have just done they are advising the rear shocks are leaking, the CV boots are perished and the bushes on the bottom arms are work so I really have no confidence in them.

Every right to have no confidence. My Skoda dealer had my car in twice for a repair which they said they were unable to fix. When I drove my car away I discovered it was fixed. They had neglected to switch off and on again to complete the repair procedure. Standard requirement when software fixes have been carried out however they forgot to do it.

There are lots of posts on here detailing how to get rid of warning lights after battery replacement. Hopefully they may cure your problem.

ABS sensor will be the culprit in my experience.

Normally the errors start with ESC failure (which is wheelspin monitoring, effectively) as it cant monitor the wheel speeds, then ABS error for the same reason, tyre pressure monitor failure, ACC cruise failure (again cant judge your speed) and blind spot failure

If you have park assist you will also see a steering error and park pilot failure, which in turn causes a parking sensor error.

Additionally if you have adaptive headlights they will also show a failure.

This isn't an exhaustive list BTW !

I didn't always have the error, sometimes it would clear by itself, and with no record of it have existed. I had to wait for the error to occur with my vagcom in the car.

Cheers for the reply Lloydster, this does fit the bill. I'll look at getting the sensor replaced to see if this helps. Ive tried the steering wheel lock to lock as suggested by Gammyleg but it's not cured the fault.

Any suggestions on how to diagnose which is at fault rather then replace them all?

Thanks.

Edited 10 July, 202510 Jul by Shanew
Extra detail

You would need to plug in to any generic OBD reader when the fault occurs, which should identify which one is at fault. There isn't another way.

If you don't have one, suggest buying one. I have an OBDEleven permanently in my drivers door so if i need it its there. It communicates via bluetooth to an app on your phone when plugged in. It would be cheaper to buy a reader and replace one sensor, than replace all four.

Cheers. I've got torque pro and an elm odb2 bluetooth dongle. I'll check for a code when I get home.

Thanks again for taking the timecto reply.

Just an update. Despite all these errors showing on dash, no faults are logged when using my odb2 code reader.

How old is the battery?

Brand new, coded and showing as good in vcd. For what it's worth, skoda did a battery test and confirmed the battery is good and no electrical drain was found. Nothing shows in vagcom so they washed their hands of it even though they could see the error on the dash.

If you’ve done what gammyleg said (full lock, left and right with engine on) and no fault codes then I’d reboot the system as such

Disconnect the battery and leave it for 10 minutes, plug back in and see what you get.

If it’s still acting like that then it’s got to be a disconnected or damaged cable somewhere I think (but this should 100% show an error in your scanning tool)

Edited 15 July, 202515 Jul by Danoid

On 10/07/2025 at 09:06, Lloydster said:

ABS sensor will be the culprit in my experience.

Normally the errors start with ESC failure (which is wheelspin monitoring, effectively) as it cant monitor the wheel speeds, then ABS error for the same reason, tyre pressure monitor failure, ACC cruise failure (again cant judge your speed) and blind spot failure

If you have park assist you will also see a steering error and park pilot failure, which in turn causes a parking sensor error.

Additionally if you have adaptive headlights they will also show a failure.

This isn't an exhaustive list BTW !

I didn't always have the error, sometimes it would clear by itself, and with no record of it have existed. I had to wait for the error to occur with my vagcom in the car.

I have this problem, i presume it is doing no harm to the car it is just an electrical fault. Have you changed the sensor and did it solve the problem. Did you do it yourself ir is a skoda dealer.garage job ?

2 hours ago, S555NOB said:

I have this problem, i presume it is doing no harm to the car it is just an electrical fault. Have you changed the sensor and did it solve the problem. Did you do it yourself ir is a skoda dealer.garage job ?

Going to be very similar to this

I suspect hardest part will be removing the old one

But which one? With no fault codes, we don't really know what's going on.

@Shanew Do your scan tools read faults from ABS etc, or just engine ECU?

@D402

Mines just an eBay special odb2 scanner for the ecu. It's been to an independent who used a Ross tech vcds and gave me a printout showing no issues and it's been to skoda who found no issues in diagnostics despite the warnings being on the dash.

For £35 from Autodoc, I can replace all 4 abs sensors if this is going to fix it. It's certainly cheaper than going back to a dealer or buying my own cable to work out which one it is, if it is a abs sensor at fault.

It's very strange, there should be codes logged to cause the faults displayed on the infotainment. I'd be tempted to unplug a sensor to see if that known fault gets logged and can be read by a scan tool. My suspicion is that either some wiring was damaged during the mechatronic change or the software updates have messed up communication to the scan tool and/or between modules causing the faults you're seeing.

Did the faults start immediately you got the car back, and are they persistent or intermittent?

@D402 The issue started a few days after the Mechtronic unit was replaced. From the video Danoid posted, it looks like I should have 12v on the sensor plug with the ignition on so I might get the multimeter out and give the wires a wiggle to see if I loose voltage. I dont have a Hex v2 cable to do any canbus diagnostics

If you have that warnings there should be several DTCs in lots of different control modules.

I had a similar problem on my Octavia recently which turned out to be 1 ABS sensor fault.

I have a Bluetooth OBD dongle ans the free version of car scanner for Android.

This tool did not report any DTCs from the ABS module despite 7 other errors in different modules.

To determine which ABS sensor might be at fault you can monitor the wheel speed.

The one that stays at 0 or is different to the others is not good.

There's more info here:

https://www.briskoda.net/forums/topic/533111-rear-wheel-speed-sensors-are-they-the-same/

However, as the mechatronic unit has recently been changed I would be more inclined to side with D402s theory that during the change something has not been reconnected properly or has been damaged.

As it's so recently after this replacement I would be going back to the garage that did it and asking them to check it

Edited 17 July, 202517 Jul by Gabbo

The local skoda dealer is a waste of time and billed me £168 to tell me they couldn't find the fault and maybe I need another new battery.

In some good news, ive had even logging running while driving and the error presented itself and was showing the front right wheel at 0mph while the rest were at 26mph. New sensor arrives Sunday so it get it swapped over, give the plug a squirt with contact and see how it goes.

This happened to our Superb a few years ago. The OSR ABS sensor had failed. Cost around £250 to replace, but looking at the vid @Danoid posted (thank you!) it looks to be a pretty easy DIY job.

Good job on the diagnosis 👍

Get some penetrating fluid onto the sensor now to give yourself the best chance of it coming out on Sunday!

Cheers for the help and advice everyone. I'll post back later, hopefully in celebration of fixing a fault with the help of a community that a main dealer with access to all the knowledge at Skoda couldn't be arsed with.

6 minutes ago, D402 said:

Get some penetrating fluid onto the sensor now to give yourself the best chance of it coming out on Sunday!

GT85 is a good penetrating/releasing fluid and longer lasting lubricant (and smells nice) shake the can, spray and leave to soak as long as possible, 24+ hours is good. - https://gt85.co.uk/

How stupid and lazy (but not unexpected) of the Dealership to just plug in a scanner and only go by 'what the computer sez', that's not diagnosis - and a scan tool is only one diagnosis tool, the human senses and where available brain can also be used as well as other tools like multimeters.

Have a look here for how to diagnosis wheel senor and other issues and how to check and cross reference your findings to confirm diagnosis, unlike many Dealerships, garages, mechanics and auto-electricians, and he admits his mistakes unlike those. - https://www.youtube.com/@mrautoservices7354

Good luck.