Acc,Front assist and start-stop problem

[IWMTom]

I bought the car just accross the border in Northern Ireland so UK consumer rights rules apply which means I’m still within that 6 month period where the dealer has to prove the fault didn’t exist, yea I should’ve taken it back sooner, when I purchased the vehicle, the dealer told me the stop start system was not working, me not intending to use that agreed to 400 euros off the original asking price as compensation, I specifically asked him however was the radarsensor fine and would the faulty sensor he referred to as causing the stop/start not to work, affect any other system in the car to which he told me it would not, those were not true statements, yes I got my part number for the Radar it begins with something like 5Q0 and ends with the letter G, I’ve sourced a replacement in a local scrapyard using partsfinder and I’m being quoted 100 euros for the part however I’ve no way of knowing whether it works or not, I may purchase that part on eBay you listed as it does mention it’s in working order and I believe it’s the exact part number as mine, if I’m able to fit it without having to recalibrate it, I should only have to pay for protection removal and coding of the part, would a VW approved dealer do this for me? Considering it’s not a grand new part supplier by them? I’m going to go after the dealer I purchased the car from in the meantime, and see what they have to say, thanks once again for the help guys much appreciated


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It's supposed to be recalibrated after removal/replacement.

You may get lucky and be within the angle tolerances but I wouldn't count on it.

Expect to pay for Component Protection removal and a calibration.

Be warned, VAG have been getting more and more irritated about used parts having Component Protection removed, even to the point of some VAG retrofit shops refusing to fit used parts anymore - something to do with potential theft and then losing their GeKo account.

 

[Carlosfandang0]

As long as the mounting bracket hasn’t moved (3) and the three adjustment screws (2) are set at the same lengths as the original radar, then alignment will not be needed,

you will probably need to get component protection removed however, but I’ve heard of people not needing to do so!

 

[Nuno1]

I rang the local VW Garage, just waiting on a quote now for protection removal, guy at the dealer says that he thinks these are chassis specific and that a used part can’t be fitted to a different car hopefully that’s not the case! Il let you guys know how it goes anyways! Thanks for all the help!


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[Mk5Dom]

Subscribed, I have exactly the same issue.

A few of you may have seen my post a month or so ago when I was greeted by Park Assist, ESC, Start Stop, Hill Hold, ACC, Front Assist and TPMS errors every time the car was driven. It turned out to be the ABS Speed Sensor and I had it replaced by my local dealership at the cost of £600.

Now, the bill wasn’t ideal but I was happy knowing that the car was back to normal and everything worked. Or so I thought…
Around 500 miles or so later the car threw up ACC, Front Assist and Start Stop errors.

I scanned the car with VCDS and everything pointed to the Front Radar Sensor as being the problem. The message from the AutoScan describes the sensor as being ‘disconnected’, I don’t have the codes to hand but I can check this evening.
I've quickly checked the terminal at the sensor end but not anywhere else.
This was later confirmed by the dealership who took the car back in to ensure there were no links to the replacement ABS Speed Sensor.

My dealership want just over £1600 to replace with a new sensor and calibrate.

Are there any UK specialists/independents out there that have access to the calibration machine, or can carry out the complete job? I joked with my Dad that I could probably drive to somewhere in Germany, have the work done and still have change from £1600.

 

[Carlosfandang0]

I rang the local VW Garage, just waiting on a quote now for protection removal, guy at the dealer says that he thinks these are chassis specific and that a used part can’t be fitted to a different car hopefully that’s not the case! Il let you guys know how it goes anyways! Thanks for all the help!


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Yes they are “chassis specific” in that they have component protection! How can they be getting you a quote to remove component protection if they believe a used part is married to the car it came off of and can’t be used on another vehicle, The service guys comment doesn’t make sense!!.

 

[Carlosfandang0]

Subscribed, I have exactly the same issue.

A few of you may have seen my post a month or so ago when I was greeted by Park Assist, ESC, Start Stop, Hill Hold, ACC, Front Assist and TPMS errors every time the car was driven. It turned out to be the ABS Speed Sensor and I had it replaced by my local dealership at the cost of £600.

Now, the bill wasn’t ideal but I was happy knowing that the car was back to normal and everything worked. Or so I thought…
Around 500 miles or so later the car threw up ACC, Front Assist and Start Stop errors.

I scanned the car with VCDS and everything pointed to the Front Radar Sensor as being the problem. The message from the AutoScan describes the sensor as being ‘disconnected’, I don’t have the codes to hand but I can check this evening.
I've quickly checked the terminal at the sensor end but not anywhere else.
This was later confirmed by the dealership who took the car back in to ensure there were no links to the replacement ABS Speed Sensor.

My dealership want just over £1600 to replace with a new sensor and calibrate.

Are there any UK specialists/independents out there that have access to the calibration machine, or can carry out the complete job? I joked with my Dad that I could probably drive to somewhere in Germany, have the work done and still have change from £1600.

That quote is far too high, try a different dealer! As I’ve said above, if the car has not had front end damage and the radar bracket hasn’t been moved, then you can EASILY set the new radar at the same angles as the old one...
The bracket (8) on my car had a pheasant implanted in it and it still didn’t move, my ACC and front assist work now as well as it’s ever done! Also if you have the newer square radar you can use the old backing plate (7) with the adjustment screws on it as it unclips from the actual radar, in this case you cannot get the adjustment wrong as it’s already set.

 

[Nuno1]

Update on the issue with the radar sensor just Incase anyone else has the same problem, I sourced a second hand radar sensor on eBay from a seller in the UK, this cost me around 225 euros+delivery, while waiting for the part to arrive I took apart my old radar sensor and found water had ingressed into the sensor and caused subsequent corrosion and failure of the PCB inside, this point of ingress looked to be through between the mating surfaces of the plastic connector housing held onto the radarsensor by 4 small torx screws, and the actual aluminium housing of the sensor itself, this joint would be subject to water hitting it at force during wet weather from spray kicked up from cars in front or heavy rain, when my new sensor arrived, I sealed every seam and gap that could possibly let water into the sensor with RTV109 silicon, this stuff is extremely durable sealant and easy to apply, when I fit the new “modified” sensor back on my car my stop start started working again straight away however I had to have the radar recalibrated as it was out of alignment (probably from the dealer messing with it originally) I had used a digital calipers to measure the distance the adjusting screws were proud, or recessed in the nut plates to try and get away without a recalibration however it didn’t work, would highly recommend if anyone has to replace their Radarsensor to take the 30-40 mns to properly prep and apply sealant to possible points of water ingress on these units, all in all it cost me around 400 euros for the entire repair!


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[Carlosfandang0]

Good to hear you got it sorted, and for a fraction of the usual high dealer costs too[emoji106].

 

[isacheema]

I'm guessing this feed is dead but it's worth a shot. I've got the exact same problem as Nuno1! I bought my 2014 Golf GT last week and on the test drive there was a stop-start error but the seller assured me it was nothing. Every time I start the car I get a Stop-Start error on the MFD and that's all, but whenever I go onto car settings and try to turn on Front Assist or City Braking or try to adjust the ACC I get a "______ is currently unavailable". There is no visible damage on the radar and a few people have told me it could be the battery of the car, but I'm so worried its the radar as the front assist doesn't work. I don't really go on the motorway trips much so the ACC isn't needed but it's the fact that it doesn't work. I've ordered an OBD 11 to read the codes and I don't really know what else to do. I'd really appreciate any advice.

 

[Paul_W]

Quite likely the stop start error is related to the radar sensor as the two seem to be connected. A couple of years ago I had a fox run out in front of me. It broke the front grille and the mount for the radar. I unplugged the radar so that it wasn't just hanging loose. When it was unplugged stop start stopped working and gave the same error message on startup. Once VW had got it reinstalled the stop start was working again.

 

[isacheema]

Quite likely the stop start error is related to the radar sensor as the two seem to be connected. A couple of years ago I had a fox run out in front of me. It broke the front grille and the mount for the radar. I unplugged the radar so that it wasn't just hanging loose. When it was unplugged stop start stopped working and gave the same error message on startup. Once VW had got it reinstalled the stop start was working again.

Thanks for the reply

I’ve booked the car into a VW specialist who quoted me £80 for a realignment, do you think this will work. I really hope I don’t have to fork out for a new radar. I still need to check if it is loose or not

 

[Paul_W]

Thanks for the reply

I’ve booked the car into a VW specialist who quoted me £80 for a realignment, do you think this will work. I really hope I don’t have to fork out for a new radar. I still need to check if it is loose or not

Not sure if alignment would cause this problem. Mine was because the sensor was disconnected

 

[isacheema]

Not sure if alignment would cause this problem. Mine was because the sensor was disconnected

The sensor is the dome sensor and it wobbles up and down. Nevertheless I’m still waiting to take it to the garage to get sorted. Also used a code reader and got a few codes from the car I didn’t understand. If I posted them on here would you know what they are

 

[IWMTom]

The sensor is the dome sensor and it wobbles up and down. Nevertheless I’m still waiting to take it to the garage to get sorted. Also used a code reader and got a few codes from the car I didn’t understand. If I posted them on here would you know what they are

If it wobbles then it just needs seating back in to its retention clips.

Please post the fault codes.

 

[isacheema]

If it wobbles then it just needs seating back in to its retention clips.

Please post the fault codes.

The code reader itself doesn’t go into much detail but typing this code into the internet shows relation to the stop start. Should I clear the code.