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    Economy/performance issue after VW cheat software update

    Posting this on behalf of a mate. He has a 2010/11 VW Golf diesel. As part of the VW emissions recall he had it done at the local main deal. Straight after the new software update was done he has notice a big drop in economy (at least 15% less mpg) and a drop in performance. He has taken it back to the same dealer and they say all is good and no fault codes.

    He has checked online and a few others have the same issues.

    So does anyone on here have any ideas? Thanks.

    28 Comments

    Isn't this what the update does, gives you the true MPG reading and not the inflated incorrect value? Or maybe they have restricted the performance to decrease emissions? I'm guessing they have had to do it to comply to ruling, to save the government increase car tax on the cars later on.

    Got the letter over a yr ago but ive not had it done for that very reason

    I just typed a lengthy answer and it vanished as the question was moved to ask. Not typing it again. Basically, that's what will happen after the recall

    Just reading online and says it restricts fuel usage, so in turn will decrease performance as not as much firing in cylinder. Some have said using higher premium fuel gives a slightly better performance.

    Ref : honestjohn.co.uk/new…ix/

    Original Poster

    But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?

    This was always going to be an issue with this situation. VW Group would not have taken the massive risk to modify the software on these cars to meet the standard when tested and operate differently when not being tested if there wasn't some tangible advantage.

    I would suggest on the face of it he's snookered, going to be very difficult to prove there has been any detrimental effect as a result of this update. If you can get enough people together (which given the might of VW fora should be possible) along with a greedy legal counsel there may be a chance to bring a case but it's not going to be easy.

    marty-401

    But his tank of fuel does less miles than before and the performance has … But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?



    That doesn't follow.

    My 1.6tdi golf is on recall too but I'm not going to do it just yet as it doesn't bother me, also holding out for proper compensation too.

    Not really, as less power and performance makes the car take longer to get to speed therefore using more fuel. I went from a 130bhp to a 90bhp hoping to save fuel, but found I use more fuel and have less fun! The recalls were all about emissions so vw will sacrifice your performance to meet these standards.

    Original Poster

    Stu

    That doesn't follow.


    Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.
    Edited by: "marty-401" 9th Feb

    marty-401

    But his tank of fuel does less miles than before and the performance has … But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?


    No. Less performance does not equate to greater efficiency.

    VW can't just reduce the cars power - it was sold as a car that would do a certain bhp/speed and MPG,
    if they deliberately reduce any of those variables, surely the car owner is entitled to a refund as they are no longer getting what they paid for?? Its just as bad as the emissions scandal itself if so.

    marty-401

    Basically he can't get it to accelerate as fast as before. So you would … Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.



    ​Decrease performance + heavier right foot = more fuel being used.

    The performance has been reduced to bring the emissions inline with permitted levels. The economy issue is just a consequence of the engine working harder to push the car along.

    Probably shouldn't have had it done. Only thing he can do now it get a tuning firm to flash the ECU back to factory standards.

    marty-401

    Basically he can't get it to accelerate as fast as before. So you would … Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.



    No mate, it's not as simple as that.

    As an example - If you see an old diesel banger going down the road with smoke pouring out the back it will be under performing and using more fuel because it is over fuelled.

    If, as I have been reading, torque is reduced this will likely be why he's got worse fuel consumption.

    The UK government has let VW owners down here. In the US VW are buying back all the diesel cars from their owners and will no longer sell diesel cars in the US.

    The only action, so far as I am aware, taken by a UK authority is that of the Mayor of London over loss of Congestion Zone revenue which frankly was a pittance for a half arsed ill thought out claim.

    Stu

    The UK government has let VW owners down here. In the US VW are buying … The UK government has let VW owners down here. In the US VW are buying back all the diesel cars from their owners and will no longer sell diesel cars in the US.The only action, so far as I am aware, taken by a UK authority is that of the Mayor of London over loss of Congestion Zone revenue which frankly was a pittance for a half arsed ill thought out claim.


    What a surprise uk customers get stitched up and the government does nowt. I honestly don't know why anyone would buy a vw group vehicle in the uk after seeing how the USA customers were dealt with compared to the uk.

    plodging

    What a surprise uk customers get stitched up and the government does … What a surprise uk customers get stitched up and the government does nowt. I honestly don't know why anyone would buy a vw group vehicle in the uk after seeing how the USA customers were dealt with compared to the uk.



    There is likely to be an affect on residual values of diesel cars because of this and the sometimes misguided view of the population on the emissions of diesel cars. Silly unfounded stunts like doubling the cost of parking a diesel car in London are well wide of the mark and do very little to address the problem.

    why did he go in for a software update when he car was fine. it was obvious that this will happen they basically use more fuel and less power to burn the emissions that were just being let out of the exhaust and know they need to let u less fumes so either the exhaust needs to be modified or the software needs to be changed so more heat is produced to burn those emissions. bit pointless as car will use more fuel give less mpg and less emissions and aswell the emissions test is stupid it should be for a distance of travel not just how many at certain rpms over certain time.

    I had my 2.0tdi passat done, was getting around 43mpg around town before and I'm now getting around 37mpg. I've also noticed that it doesn't have as much 'kick in the ass' torque as it had before when I put my foot down.

    But hey, at least they gave me a free official vw umbrella, keychain and pen

    get it remapped to around 200bhp and bill vw

    What VW did was cheat on the emissions, what they have had to do is effectively retune the engine to meet the emissions target, this means less power AND less mpg.

    In just the same way the catalytic converter strangles the engine and reduces power and mpg; all in the name of reducing CO2 emissions.

    VW werent alone, nor were they the worst; a number of makers are quietly having engines retuned during services, and paying the US government massive fines; of course the UK government are sticking to their original VW lie, that none of it happens here.

    Fiat, Mercedes, Hyundai, Toyota, Volvo, Renault, Audi; those are some of the names I seem to remember from the original list of cheaters.

    Edited by: "Gentle_Giant" 9th Feb

    Volkswagen have just become no.1 car maker in the world perhaps thanks to all this publicity despite it being negative and they can simply detune a car to reduce its performance and efficiency but lower emissions and walk away despite this surely voiding the contract of sale for a false claim of specification. People should be able to return the car and just say 'refund please'.

    I'm a bit late to this but I have just had the fix done to my 1.6

    I used to get 70mpg when driving for 200 miles mostly (say 170 miles) at 70mph at 2000rpm

    Today I got 59mpg doing the same journey. My car didn't feel particularly sluggish and was still driving along at 70mph at 2000rpm. Is this just the software update just giving me a correct mpg whereas I was used to seeing incorrect figures?

    Original Poster

    dobsonscott

    I'm a bit late to this but I have just had the fix done to my 1.6I used … I'm a bit late to this but I have just had the fix done to my 1.6I used to get 70mpg when driving for 200 miles mostly (say 170 miles) at 70mph at 2000rpmToday I got 59mpg doing the same journey. My car didn't feel particularly sluggish and was still driving along at 70mph at 2000rpm. Is this just the software update just giving me a correct mpg whereas I was used to seeing incorrect figures?


    The only comparative test you can do is compare like for like journeys using the same fuel. Then from a full tank to full tank work it out yourself.....this then eliminates any sortware changes.

    marty-401

    The only comparative test you can do is compare like for like journeys … The only comparative test you can do is compare like for like journeys using the same fuel. Then from a full tank to full tank work it out yourself.....this then eliminates any sortware changes.



    I did my same journey (M62, M6, M42, M40) and even fuelled up at the same garage as I always do before setting off. Last week it would have given me 70 mpg, this week it gave 59 mpg. I guess my new target mpg is now 60 from now on.

    Edited by: "dobsonscott" 8th Jun

    Original Poster

    Next time fill up until it clicks off.....then do your normal journey.....then fill up at the same pump until it clicks off (make sure the nozzle is inserted the same amount both times for accuracy).....then work out your mpg based on the milage covered and fuel used.
    Compare this to what your trip computer tells you and also to what you were getting before (if you have it).

    marty-401

    Next time fill up until it clicks off.....then do your normal … Next time fill up until it clicks off.....then do your normal journey.....then fill up at the same pump until it clicks off (make sure the nozzle is inserted the same amount both times for accuracy).....then work out your mpg based on the milage covered and fuel used.Compare this to what your trip computer tells you and also to what you were getting before (if you have it).


    Got it. I'll give it a try. Thanks
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