Here are some key specifications for the 1998 Audi A4 B5 1.9 TDI:

Engine:
Type: Inline-4 turbocharged diesel engine
Displacement: 1.9 liters
Power: Approximately 90 horsepower (67 kW)
Torque: Around 155 lb-ft (210 Nm)

Transmission:
5-speed manual transmission was common, but there might have been an option for an automatic transmission.

Performance:
0-60 mph (0-97 km/h): Approximately 12 seconds
Top Speed: Around 112 mph (180 km/h)

Fuel Economy:
City: Approximately 28-30 mpg
Highway: Approximately 40-45 mpg

Dimensions:
Length: Approximately 178.1 inches
Width: Approximately 68.2 inches
Height: Approximately 55.7 inches
Wheelbase: Approximately 102.6 inches

Weight:
Around 2,932 lbs (approximately 1,330 kg)

Suspension:
Front: Independent suspension with MacPherson struts
Rear: Independent suspension with torsion beam axle

Brakes:
Front: Disc brakes
Rear: Disc brakes

Tires:
Tire size varied based on the specific trim and optional packages.
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It's important to note that specifications may vary based on the specific trim level, optional features, and the country in which the vehicle was sold. Always refer to the vehicle documentation or contact the manufacturer for the most accurate and up-to-date information.