About Paul Expertise I`m familiar with most Golf/Jetta/Fox tune up, electrical, brake and suspension repairs, from 1977 to 1997. I have very little knowledge on transmission repairs.
Experience Worked as a mechanic for VW dealers from 1979 to 1988
Question I have a 2001 VW Jetta (1.9L turbodiesel engine) with about 80K miles on it and the check engine light has been coming on intermittently for about the past two weeks. It seems like the light will come on in the mornings when I get up and drive it to work. It will stay on when I drive to lunch but it will finally go off in the afternoon on my way home from work and be fine for the rest of the evening. The car never idles badly, loses power, or puts out any smoke and it seems to be running perfectly normal when the light comes on. I went by Autozone and they hooked up the handheld diagnostic tool which read "P1248 Manufacturer Control Fuel Air Metering." When he looked up this same error message on the computer inside the store it read off the line "Turbo Boost Pressure not detected." The VW repair book says that it is a "Injection Start Control Deviation." I am at a complete loss as to what could be wrong with the car. At about 45K miles the car started running terribly and the dealer replaced the fuel injection pump along with the control module (thank goodness the warranty covered it) - could this be something related to it? I like the car quite a bit but am really wondering if I should get rid of it before I run into major problems.
Answer Nick,
Yes this could be related to your previous repair, but it may also be caused by carbon build up in the intake and intake manifold. The system seems to plug up and restrict the air flow and thus reduce the turbo chargers ability to increase horsepower. This is caused by the constant use of synthetic oil.
Have it checked out and cleaned. Then try switching to regular oil (not synthetic) during moderate tempurature months (not too hot not too cold), I've found this works very well.
Also, check that your coolant level is completely full, this will send a fault when the engine is cold.
