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2007 MERCEDES-BENZ S65 AMG
6.0L V12 BiTurbo M275•RWD•AUTOMATIC•gas•M275•turbo
🏆Sponsored by Chris H· Danville, IN
Repairs423Labor489Torque3427Fluid8DTC1032Battery1Maintenance0Recalls0
P0030low severityPowertrain

HO2S Heater Control Circuit Bank 1 Sensor 1

on 2007 Mercedes-Benz S65 AMG 6.0L V12 BiTurbo M275 · RWD

What this code means

The PCM detected a malfunction in the heater circuit of the upstream heated oxygen sensor (Bank 1, Sensor 1).

Symptoms

  • Check Engine Light
  • Poor fuel economy
  • Longer warmup emissions
  • Failed emissions test

Common causes

  • Faulty O2 sensor heater
  • Blown fuse
  • Wiring issue
  • PCM heater driver failure

Diagnostic steps

  1. Check O2 sensor heater fuse
  2. Test heater circuit resistance (should be 2-30 ohms)
  3. Inspect wiring to sensor
  4. Check PCM heater control output

Repair notes

Replace O2 sensor if heater resistance is out of spec. Check fuse and wiring first.

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