Suddenly the mpg display on my 2002 VW Passat estate has gone crazy and just seems to generate random numbers. Indeed at one time informed me I was getting 198 mpg ! Any reason for such a malfunction or any ideas for a quick fix? All help appreciated.
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert that has 1 follower.
Re: The mpg display has a fault.
You have switched the trip computer to instantaneous fuel consumption rather than average.the switch on the end of the wiper stalk.press the switch until you get back to average consumption ,i think it shows a circle with a line through it from memory
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I have a VW Passat estate 2008, the dashboard screen has now got the letters MFD Speed warning on it, it came on when I was in a queue of traffic doing about 15mph. Does anyone know what this means and what I can do about it?
Hazard warning lamps fuse for 2002 VW Passat is number 39: F39 (15A) = Hazard warning lamps
For 2002 VW Passat the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram.
The info that is gatthered on your display is taken from the engine ecu which is calculating average mpg, average distance, how many miles left in your tank etc. The only faulty part is your dash insert (speedo clocks). As you probably gather all the info is gathered electronically,from your throttle movement to the altitude of the vehicle which along with many other statistics is calculating your mpg, it wont be your ecu or would experience more seroius problems, so I am betting on your dash clocks,but get it diagnosed before spending money, hope this helps.
This is a potential solution but if you are traveling down the highway and take your foot off the gas (or if you are on cruise no gas is required to maintain your speed) then the instant mpg calculation is similar to this 60 MPH / 0.0 GPH so effectively you end up with infinite gas mileage. But because the motor has to idle it's always using a little gas so it puts a very small number for the denominator which ends up giving you a high MPG. I've seen this happen in many makes of cars and I don't think it's anything to worry about.
If the engine requiresPrem fuel I would use it, the problems of not using it are possible piston damage. decreased power and lower fuel economy, when regular is used the knock sensor pulls the timing back to reduce knocking, this i where the lower MPG comes in and power problems, if knock can not be eliminated then the pistons may be damaged. I have a Corvette that uses Prem fuel, if I run regular I loose 3 MPG, so the trade for lower cost fuel is cancelled out by the loss of MPG.