Question about 1999 Volkswagen Passat

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High mpg My 1999 1.6l passat with about 96000 mileage now gives me very low mpg (averagely 20-22mpg). Changed air filter, plugs but problem still exists. could it be o2 sensors, dirty trottle, or any other problem. please help solve, as all mechanics give me different answers.

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ITS MORE THAN LIKELY ITS A SENSOR NOT JUST THE O2 SENSOR, MOST NEWER VEHICLES HEAVILY RELY ON INFORMATION FROM THE EXHAUST SO THE THE COMPUTER CAN AJUST THE SETTINGS FOR FUEL REGULATION, U CAN CHANGE MOST OF THE SENSOR ASSOCIATED WITH THE EXHAUST SYSTEM WHICH MAYBE 2 OR 3. THE EASIEST WAY AND MOST COST EFFECTIVE IS TO GET A DIAGNOSTIC OF THE BAD SENSORS THEN DECIDE ON THE BEST METHOD OF REAPIR

Posted on Aug 12, 2008

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Could be a combo of components that are causing your poor fuel mileage.
Dirty air filter is the 1st thing to check - after that.
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My 2005 vw passat sedan is consuming too much fuel.fuel filters have been changed. could it be a problem from the control board?


Mileage can be affected by a multitude of things. Your driving habits will be the largest contributing factor but if those havent changed I would suggest the following:

Air filter replacement (k&n will get you more mileage)
plugs, wires, ignition coil (basic tune up stuff)
make sure the air pressure in your tires is correct
Make sure your calipers arent dragging on your rotors, this is probably not the case as I have rarely seen all four calipers drag at the same time, but if some are dragging more than others than this will increase wear and tear on your brake system and significantly lower your mileage.

If there are no check engine lights showing then I wouldnt think you have any sensor problems, but your o2 sensor can case your mileage to go down if its bad, but this should trip a trouble code.

I would not trust the on board computer to calculate your mileage either, there are too many variables for it to measure your mileage accurately. I would put a known amount of fuel in the car and reset your pedometer, drive normally and calculate your mileage manually before doing any tuneup. This will give you your mileage as your cars computer may be out of whack.

I average 33 mpg in my 07 passat automatic (by reading the onboard computer) on the highway. In town i get 22-26 depending on how I drive it. The mileage on this computer will fluctuate wildly when going up hills and down hills, during acceleration and braking, its just not an accurate measure of your mileage more like a guestamation by the vehicle.

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1 Answer

MPG has dropped


Air filter? And any car I have ever owned with a timing belt has shown a noticeable drop-off in MPG when the belt had some miles on it. I would do what you have done but added (or at least eyeballed) the air filter. If that didn't bring it back, the timing belt was next since it doesn't take hardly any stretching to throw off the valve timing and it is critical to performance and MPG.

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Is Age associated with really bad gas mileage?


well to me that is not very good mileage . have you had the vehicle long ? also did it get better mileage when it was newer ? how about plugs wires etc what has been changed and tuned up ? I would think it would get better than that alot of bigger pickups get that good or better.hows your driving habits ? Jerry

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change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.

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