I presume you experienced a loss of full power but had enough to get home. The check engine lamp came on too?
It seems your engine is in limp mode due to a possible over boost pressure . The ECU runs the engine with reduced power after an over boost is detected. If you cycle the ignition key and power comes back, this is most likely problem.
A fauliy N75 solenoid, with three small bore vacuum hoses and an electrical plug/connector, is possible cause .
This over boost can be caused by sticking vanes inside the turbo .
Have it scanned and read the codes. Code P0234 will be set if over boost occurred.
SOURCE: temperature sensor audi a4
Possibly located at the back of the engine behind cylinder head, usually located in a small plastic hose block.
TL
SOURCE: transmission problem with a 1999 audi a4 quattr0 2.8l
you may not need a transmission replacement, just try replacing the sensor of the transmission, it may help
SOURCE: I am experiencing power loss
these vehicles are known for ignition coil failure. typical symptoms include: Misfire, power loss, vibrating engine, poor fuel consumption. If the vehicle's engine vibrates, it be misfiring. Is your chk engine light on???
SOURCE: audi a4 tdi loss of power after rain
Replace the actuation solenoid as this unit can be affected by dampness.
Quick way around this as a fast fix is diconnect the vac line to the EGR valve and plug with a screw or pencil. This will stop the valve from opening thus filling the inlet manifold with oxygen starved air i.e exhaust fumes.
Car with then drive normally. Solenoid referred to as N239.
SOURCE: Audi A4 1.9 TDI 130BHP engine power loss when it's raining
This is the correct solution..........replace the solenoid valve N239 as the electrical connection is affected by dampness. What happens is that the EGR valve is jammed open by the solenoid and this allows oxygen starved air into the cylinders (exhaust gas) and combustion is poor.
Quick fix is to disconnect the vac hose to the EGR actuator and block the end with a self tapping screw or pencil. This will work for sure....
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