O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1
The P2241 code indicates that the powertrain control module (PCM) has detected a low voltage or current condition in the positive current control circuit for the oxygen sensor located on Bank 2, Sensor 1 (upstream of the catalytic converter). This circuit is responsible for regulating the sensor's heater and pump current. A low signal can result from wiring issues, a faulty oxygen sensor, or a PCM problem, leading to inaccurate air-fuel ratio readings and potential drivability issues.
1. Most Common Causes
- Faulty or degraded oxygen (O2) sensor (internal damage)
- Short to ground in the positive control circuit wiring
- Excessive resistance at the sensor connector terminals
- Damaged or pinched wiring insulation
- Engine control module (ECM/PCM) failure in circuit control
- Corroded or loose connections in the sensor harness
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the wiring and connector for Bank 2 Sensor 1 for damage, corrosion, or loose connections.
Step 3: Test the oxygen sensor's heater circuit and signal voltage using a multimeter; compare to manufacturer specifications.
Step 4: If wiring and sensor are okay, test the PCM output to the sensor circuit; replace PCM if faulty.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause poor fuel economy, reduced performance, and potential damage to the catalytic converter. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or PCM replacement is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.