O2 Sensor Positive Current Control Circuit High Bank 2 Sensor 1
The P2242 code indicates that the powertrain control module (PCM) has detected a high voltage or current in the positive current control circuit of the oxygen sensor located on bank 2, sensor 1 (upstream of the catalytic converter). This circuit is responsible for regulating the heater element of the O2 sensor. A high condition suggests a short to voltage, a faulty sensor, or a PCM issue. This can cause incorrect air-fuel ratio readings, leading to poor engine performance and increased emissions.
1. Most Common Causes
- Faulty oxygen sensor (bank 2, sensor 1)
- Short to voltage in the heater control circuit
- Damaged wiring or connector
- Failed PCM (rare)
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: Scan for codes and record freeze frame data.
Step 2: Visually inspect the O2 sensor wiring and connector for damage or corrosion.
Step 3: Test the heater circuit voltage and resistance using a multimeter.
Step 4: Replace the oxygen sensor if circuit tests are normal and sensor is faulty.
Step 5: Clear codes and test drive to verify repair.
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 performance, reduced fuel economy, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.