Odometer miles out

[tommccabevRS]

As some of you will have seen I've been having problems with my mpg lately as it halved and I couldn't work out why.

This morning on the way to work I've noticed the odometer (one that counts how many miles Yav done ha) is under reading by a lot. My drive to work is 37 miles and 37 back, got to work and it's saying I've only done 23.5 miles and I set off with 5.1 miles already on there so it's saying I've done about 18.4 miles on my 37 mile journey? That's about half of what it's meant to be the same as the drop in MPG.

Has anyone ever had this problem before or know what can cause it because it's driving me insane.

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[spud31]

sounds like a speed sensor issue as speedo reading taken from left front wheel.

i wonder if bearing on way out and giving silly readings

vcds will show what speed in kmh car thinks its doing

Is the self locking still working above 5mph

[Guest BigJase88]

Not bad!

Change it in 50k and you'll only register 25k on the odo

[gfwc]

Not bad!

Change it in 50k and you'll only register 25k on the odo

My speedo doesn't work at all, so adding 0 miles

[Guest BigJase88]

My old corsa b fag lighter used to blow the speedo fuse back in the day. God knows why. Was handy though

[tommccabevRS]

Aye gunna have to get it Vag com'd now, coming home from work and it's gone into limp mode. So ****ed off with the thing. Only upside is I've got an excuse to get my Rallye back out haha.

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[spud31]

im wondering if the dash has lost its milage calibration code so thinks its got a 5 sp box etc

[tommccabevRS]

Well got the car plugged into vagcom yesterday came up with a few fault codes the main one which I thought it was the MAF sensor. Also manifold pressure and manifold temperature sensor, gunna bang a maf sensor in and see how It goes from there.

Also got front right vehicle speed sensor or abs which will probably explain the mad mpg and low odometer reading. Hopefully get it all sorted tomorrow.

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[Richard-vrs]

From what i understand the mpg is worked out from the fuel maps, i.e. drivers wish, smoke map and torque map and the odometer..

If there is a fault with the maf i would imagine its limiting the fuel by the smoke map and if the speed sensor is a bit off aswell it throws the whole calculation off.

[tommccabevRS]

Well I've got the car sorted, put a New MAF In it but it was still in limp mode so went and got a new MAP sensor and that's cured it running sweet as a nut now.

Just need to buy a front right and sensor then I'll have no lights on the dash for the first time in ages lol !

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