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2000 BMW 528I
2.8L I6 M52•RWD•AUTOMATIC•gas•M52B28
1 active safety recall on this vehicle — view recalls
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Repairs0Labor495Torque3158Fluid8DTC1997Battery1Maintenance0Recalls1
P0035low severityPowertrain

HO2S Heater Control Circuit High (Bank 1 Sensor 2)

on 2000 BMW 528i 2.8L I6 M52 · RWD

What this code means

The heater circuit for the downstream oxygen sensor on bank 1 is reading high voltage or an open condition. This slows sensor warm-up and can affect fuel trim readiness.

Symptoms

  • Check engine light on
  • Failed emissions readiness
  • Slightly reduced fuel economy

Common causes

  • Faulty O2 sensor heater element
  • Blown heater fuse
  • Wiring or connector damage
  • Failed PCM driver

Diagnostic steps

  1. Scan and confirm code with freeze frame
  2. Check O2 sensor heater fuse
  3. Measure heater circuit resistance and voltage
  4. Inspect wiring and connectors to sensor
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