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Home / DTC / P0141 — Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2

P0141 — Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2

Detailed page for trouble code P0141.

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Code

P0141

HUMMER P — Powertrain

Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed downstream O2 sensor heater element
  • Open/short or high-resistance wiring in heater circuit (power or ground)
  • Corroded/loose sensor connector or PCM connector
  • Blown fuse or faulty relay supplying sensor heater
  • PCM/ECM driver fault (rare)
  • Aftermarket or contaminated sensor with degraded heater

Symptoms

  • Check Engine Light (MIL) illuminated
  • Failed emissions test / readiness monitor for O2/catalyst
  • Possible increased tailpipe emissions
  • Usually no immediate drivability loss (downstream sensor), but long-term fuel/diagnostic issues

What to check

  • Verify code P0141 and any additional related codes with a scan tool; record freeze-frame and live data
  • Inspect sensor wiring and connector for corrosion, damage, or water intrusion
  • Check relevant fuses and relays that supply the O2 sensor heater circuit
  • Measure heater circuit voltage and ground presence at the sensor connector while engine is off and while the PCM commands the heater
  • Measure heater resistance at the sensor (unplug sensor first) and compare to specification
  • Monitor downstream O2 sensor heater command status and voltage/current with scanner or lab scope

Signal parameters

  • Heater supply voltage: ~12 V (battery voltage) available at power feed with ignition on
  • Heater control: PCM may switch ground or use PWM; commanded duty can be 0–100%
  • Heater current: typically up to a few amps depending on heater resistance (common range ~0.5–2 A)
  • Heater resistance (typical narrowband downstream HO2S): about 2–20 ohms (manufacturer spec required for exact value)
  • Sensor signal (downstream): usually steadier than upstream; ~0.2–0.8 V depending on condition (heater-specific tests focus on heater circuit, not signal)

Diagnostic algorithm

  1. Read and record DTCs, freeze-frame, and live data. Note if code is confirmed or pending.
  2. Visually inspect the Bank 1 Sensor 2 connector and wiring for damage, corrosion, or pins pushed out. Repair any visible faults.
  3. Check heater fuse(s)/relay(s). Replace if blown or faulty and retest.
  4. With ignition ON (engine OFF), verify battery voltage at the heater power pin of the sensor connector. If no power, trace to fuse/relay and repair.
  5. With connector unplugged, measure heater resistance across heater pins. If open or significantly out of spec, replace the sensor.
  6. Reconnect, back-probe the heater control pin. Start engine (or follow manufacturer procedure) and command heater via scan tool if available. Verify PCM is commanding heater (ground or PWM) and measure voltage/current. If PCM commands but no current flows, suspect open wiring or bad heater element.
  7. Perform a wiggle test on wiring while observing heater current/commands to detect intermittent faults.
  8. If wiring and supplies are good but heater not functioning, consider replacing the Bank 1 Sensor 2. After replacement, clear codes and road-test to verify readiness and code absence.
  9. If new sensor also fails and wiring/power/ground are confirmed, test PCM heater driver output. If driver is defective, consult manufacturer repair information before replacing PCM.
  10. After repairs, erase codes and perform a drive cycle or use a scan tool to run readiness tests and confirm the fault does not return.

Likely causes

  • Failed heater element in the Bank 1 Sensor 2 oxygen sensor
  • Corroded or damaged heater power/ground wiring or connector at the sensor
  • Blown heater fuse or bad relay feeding the heater circuit
  • PCM low-side driver failure (less common)

Fault status

⚠️ Status
PCM detected insufficient heater performance in Bank 1 Sensor 2; heater not reaching expected current or temperature when commanded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0140 P0142 P0138 P0037
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