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Home / DTC / P2241 — O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1

P2241 — O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1

Detailed page for trouble code P2241.

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P2241

Generic P — Powertrain

O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 23 RU: 27
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Page language: EN

Causes

  • Open, corroded or damaged wiring/connectors to Bank 2 Sensor 1
  • Poor or intermittent ground or power supply to the sensor circuit
  • Contaminated or failed Bank 2 Sensor 1 (upstream O2 sensor)
  • Short to ground or high resistance in the positive current control path
  • Blown fuse or relay feeding sensor/ECM circuits
  • Exhaust leak or physical damage to sensor making readings invalid

Symptoms

  • Check Engine light (MIL) illuminated
  • Reduced fuel economy or rich/lean running symptoms
  • Failed emissions test
  • Rough idle, hesitation or uneven running under some conditions
  • Stored related O2/heater/trim DTCs

What to check

  • Read and record freeze frame and OBD data with a scan tool; note engine load, RPM, temperature and fuel trims
  • Verify code is current (not pending); check for multiple related DTCs (heater or other O2 codes)
  • Perform visual inspection of Bank 2 Sensor 1 harness and connector for damage, corrosion, melting or loose pins
  • Check for recent exhaust work, leaks or damage near the sensor
  • Inspect fuses/relays that feed sensor circuits and ECM power/grounds

Signal parameters

  • Bank 2 Sensor 1 is an upstream O2 (pre-catalyst) — expected raw voltage swings roughly 0–1.0 V in closed-loop; lean < ~0.45 V, rich > ~0.45 V
  • Heater circuit: typical resistance varies by sensor but commonly a few ohms to tens of ohms; heater supply is battery voltage when activated
  • Positive current control pulses are usually low-mA range; ECM monitors current flow and duty/pulse characteristics rather than steady high current
  • If available, live-data should show rapid switching of O2 voltage in closed-loop and stable heater supply voltage

Diagnostic algorithm

  1. Retrieve freeze frame and related codes. Note driving conditions when code set.
  2. Visual inspection: trace wiring from Bank 2 Sensor 1 to harness, look for chafing, heat damage, corrosion, pin pushed out, or signs of water ingress. Repair any obvious damage.
  3. Check power/ground: with ignition ON, backprobe connector and verify heater supply and sensor reference grounds present per vehicle wiring (use wiring diagrams). Confirm fuses/relays feeding the circuit are good.
  4. Measure heater resistance at the sensor (with connector disconnected). Compare to vehicle spec. Very high/OL indicates open heater. Very low may indicate short. Replace sensor if heater fails spec.
  5. With a scan tool, monitor Bank 2 Sensor 1 voltage and (if supported) O2 sensor current or circuit status. Look for expected switching when engine at normal operating temp and in closed-loop. If sensor is fixed or signal abnormal, suspect sensor or wiring.
  6. Check for short to ground/power: using a multimeter, check continuity from sensor positive/current control wire to ground and to battery; look for unintended shorts or high resistance.
  7. Perform wiggle test on harness/connectors while monitoring live data for intermittent changes. Repair any intermittent faults (repair or replace connector/harness as needed).
  8. If wiring is intact and sensor heater and signal are within expected ranges but ECM still reports low current, consider ECM driver fault. Confirm with manufacturer-specific diagnostic procedures before ECM replacement.
  9. After repairs, clear codes and test drive to confirm fault does not return and closed-loop operation/short-term fuel trims are normal.

Likely causes

  • Broken or frayed harness near the sensor (heat/chafing)
  • Corroded connector pins or water ingress at sensor connector
  • Failed oxygen sensor (internal element degraded)
  • Short to ground in the sensor positive/current return circuit
  • Poor chassis or sensor ground

Fault status

⚠️ Status
ECM detected lower-than-expected positive current in the Bank 2 Sensor 1 oxygen sensor control circuit. This indicates a fault in the sensor circuit, wiring, sensor, or control driver that can affect fuel control and emissions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
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