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Home / DTC / P0058 — Oxygen sensor heater2(rear) high

P0058 — Oxygen sensor heater2(rear) high

Detailed page for trouble code P0058.

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Code

P0058

MITSUBISHI P — Powertrain

Oxygen sensor heater2(rear) high

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

Causes

  • Short to battery positive in the heater circuit (wiring or connector)
  • Failed/heater element internally shorted or damaged in the O2 sensor
  • Corroded, bent, or water-intruded connector causing erratic voltage
  • ECU heater-driver malfunction (stuck high)
  • Aftermarket sensor or incorrect installation/wiring

Symptoms

  • Malfunction Indicator Lamp (CEL/Check Engine) illuminated
  • Longer-than-normal sensor warm-up time or delayed closed-loop operation
  • Reduced fuel economy or improper fuel trims
  • Failed emissions readiness or increased tailpipe emissions
  • Possible rough idle or drivability complaints if sensor out of range

What to check

  • Read freeze-frame data and confirm P0058 is current/active; note conditions
  • Visual inspection of sensor wiring and connector for damage, corrosion, water
  • Backprobe heater supply and control pins; compare voltages with service specs
  • Measure heater-element resistance at the sensor (cold) and compare to spec
  • Check for short to battery (+) between heater control and B+ with ignition off
  • Confirm ECU control behavior (command on/off) with scan tool; check waveform

Signal parameters

  • Heater element resistance (typical): roughly 2–20 ohms — consult vehicle service data
  • Expected heater supply when commanded ON: near battery voltage (approx. 11–14.5 V) or PWM from ECU
  • Expected heater control when OFF: near 0 V or driven low by ECU (may be pulsed)
  • Expected heater current range: roughly 0.5–6 A depending on resistance and supply voltage
  • Exact values vary by model — always verify with the manufacturer's specifications

Diagnostic algorithm

  1. Verify code and conditions with a diagnostic scanner; record freeze-frame and freeze conditions.
  2. Visually inspect the rear O2 sensor (sensor 2) connector and wiring for damage, corrosion, pin push-out, or water intrusion. Repair any obvious damage.
  3. With ignition OFF, disconnect the O2 sensor and measure heater resistance across the heater pins. Compare to service specification. An open or near-zero resistance indicates a fault.
  4. Check for unintended continuity between the heater control circuit and battery positive (B+). Continuity to B+ suggests a short to battery.
  5. Reconnect sensor, backprobe harness with ignition ON (engine off). With ECU not commanding heater, verify voltage levels on the heater supply/control pins per service manual. Then command heater ON with a scan tool and observe voltage or PWM waveform and current draw.
  6. Wiggle the harness and connectors while watching live data/voltage to detect intermittent faults.
  7. If wiring and connector check OK but the heater reads abnormal, substitute a known-good sensor to see if DTC clears.
  8. If a known-good sensor does not clear the code and wiring is intact, suspect ECU heater-driver fault — confirm with dedicated wiring/ECU tests before replacing ECU.
  9. After repairs, clear codes, run readiness, and perform a test drive to confirm the fault does not return.

Likely causes

  • Heater circuit pin shorted to B+ at harness or connector near sensor
  • O2 sensor heater element internally shorted to B+
  • Poor connector contact or corrosion creating unexpected voltage reading
  • Faulty ECU output stage driving the heater with unintended voltage
  • Wiring repairs or modifications with reversed/incorrect connections

Fault status

⚠️ Status
P0058 — Oxygen sensor heater 2 (rear) circuit voltage higher than expected ( heater circuit high ). Inspect sensor heater, wiring, connectors and ECU heater driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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