C0071 Steering Angle Sensor Malfunction

Subaru, Toyota, Lexus

When the steering wheel angle goes beyond acceptable range of values, SAS (Steering Angle Sensor) will set a DTC. This usually happens after repair on the steering components.

• Try setting SAS to 0 degrees if it was misaligned (and you remeber which way and how many turns you need to make)  and try to calibrate it with a scanner.
• If it doesn’t calibrate, the following procedure can be performed in an attempt to unlock SAS’s functionality.
• If this procedure will not work, replace the sensor.

Conditions

Steering angle PID shows constant 00 (or 7190), while turning. Calibration says “unsuccessful, misaligned”

How to Fix

• Put steering wheels straight.
• Disassemble steering angle position sensor.
• Mark the location of both gears!
• Load a good dump into the EEPROM (93C66, 24C02, etc.)
• Put everything back.
• Steering Angle PID should start responding now.
  • Slowly determine which way to turn towards center, 0 degrees.
    • E.g., if scanner showed -719 degrees, turn SAS counter-clockwise twice until it reaches 0.
• If PID stuck again because it was out of bounds, turn ignition off and turn SAS one turn to the left (if was stuck on positive number), then turn ignition ON.
• When shows 0 degrees, perform calibration again.