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The dreaded opel 4 cyl inline ,most of my problems with this range of vehicles is caused by the fact that the computer is bolted to the inlet manifold and suffers from overheating which causes all mannor of code faults and often the immobilisor.Right mass air flow is in the pipe from the air filter to the inlet manifold
have you checked the wiring to the sensors. the plugs on them can become damaged. use a paper clip and linc the holes and check the light has gone out do this on both front wheels. find which one is at fault. dont do both at same time but you can have both wheels off at the same time to save time.
ABS Fault Code List 1991 Corvette (C4) Code Definition 21 Right Front Wheel Speed Sensor Fault 22 Right Front Toothed Wheel Frequency Error 25 Left Front Wheel Speed Sensor Fault 26 Left Front Toothed Wheel Frequency Error 31 Right Rear Wheel Speed Sensor Fault 32 Right Rear Toothed Wheel Frequency Error 35 Left Rear Wheel Speed Sensor Fault 36 Left Rear Toothed Wheel Frequency Error 41 Right Front Solenoid Valve Fault 45 Left Front Solenoid Valve Fault 55 Rear Wheels Solenoid Valve Fault 61 Pump Motor or Motor Relay Fault 63 Solenoid Valve Relay Fault 71 Electronic Brake Control Module Fault 72 Serial Data Line Fault 75 Lateral Accelerometer Fault (Short ot Open) 76 Lateral Accelerometer Fault (Signal out of Range)
I'm going to guess and say have the catalytic converter checked. If that's it...it will also be giving you poor performance and mileage.
Also replace the exhaust sensors and check the plugs for condition and gap. Replace the air filter and pcv valve.