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Major Service recently. Now fuel economy suffers?


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#1 peacehavenboy

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Posted 25 June 2019 - 08:38 PM

Hi ......... I have had my C4 Grand Picasso 1.6 Hdi manual 2009 for about 2 years.

It hadn't been serviced in that time unfortunately but it was returning approximately 50 mpg, also .

for each of the 12 notches on the fuel gauge it was getting around 50 miles.

Recently I booked the vehicle into a Halfords Autocentre locally for a major service and asked for them to keep my old pollen and air filters.

New Mobil 1 ESP was also used to replace the old black oil.

Now I am finding that my fuel economy has been severely affected returning 103 miles each 3 notches instead of around 150 miles.

HOW CAN THIS HAPPEN?  Any ideas what might have caused this? I thought with clean quality oil and new filters it would slightly do better on fuel, not a lot less!        Hoping anybody can advise me on this and if I emailed a complaint to Halfords H O what could I say?

Thanks in anticipation.


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#2 stimulator

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Posted 26 June 2019 - 09:13 PM

Did they adjust the handbrake maybe it's binding now.
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#3 peacehavenboy

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Posted 27 June 2019 - 05:31 AM

Don't think so Stim.
The only thing that ive changed apart from the service being done was new tyres on the front and filling up with diesel at Asda when I normally use Esso?

#4 Lancelot

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Posted 27 June 2019 - 08:47 AM

Have you tried brim to brim calculations?  Fill it several times to get a better idea what it is doing.


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#5 peacehavenboy

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Posted 27 June 2019 - 12:31 PM

Will try that, also will go back to putting Esso in it.
Somebody told me to check that I hadn't been left with an air leak, they maybe hadn't put the air filterback properly or something?
But first port of call would be to take it back to them?

#6 discv

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Posted 28 June 2019 - 08:45 AM

Changing the air filter on a C4GP, whilst not rocket science, does require care and common sense to get it all back together without breaking or misplacing something.

Now, I understand that you gave the task to Halfords...........

My last experience of Halfords was when they jacked the side of the car using one jack in the centre of the sill, instead of locating the jacking points. Twisted the shell for me.


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#7 Ozzie

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Posted 28 June 2019 - 08:49 PM

could be the ecu relearning ,due to increased air flow, different fuel etc.

should improve as it adapts

#8 granpa

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Posted 29 June 2019 - 01:32 PM

Cant be that much if it is 'relearning' he was getting good fuel returns prior to the service



#9 stimulator

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Posted 29 June 2019 - 05:11 PM

Possible they disconnected the battery for come reason and did a BSI reset. That would cause the system to relearn again.
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#10 peacehavenboy

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Posted 21 July 2019 - 05:19 PM

Hi Stim
Looks like that kind of thing was the case with some sort of relearning?.
The really good fuel economy is back with a vengeance (over 500 miles and not yet got to the 11/12 notches yet.
Happy bunny now. Lol.

Edited by peacehavenboy, 21 July 2019 - 05:21 PM.