O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1
Code P2237 indicates an open or malfunction in the positive current control circuit of the oxygen sensor (Bank 1, Sensor 1). This circuit is responsible for regulating the heater element current in the air-fuel ratio sensor. When the PCM detects an open circuit, it sets this code, often due to a damaged wiring harness, corroded connector, or a failed sensor. This can cause incorrect air-fuel mixture readings, leading to poor engine performance and increased emissions.
01. Most Common Causes
- Open or short in the O2 sensor heater circuit wiring
- Corroded or damaged O2 sensor connector
- Failed O2 sensor (Bank 1 Sensor 1)
- Blown O2 sensor fuse
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P2237 is present.
Step 2: Visually inspect the O2 sensor wiring and connector for damage or corrosion.
Step 3: Test the O2 sensor heater circuit for continuity and resistance using a multimeter.
Step 4: Check the O2 sensor fuse and replace if blown.
Step 5: If wiring and fuse are good, replace the O2 sensor (Bank 1 Sensor 1).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with this code, as it can cause poor fuel economy and potential damage to the catalytic converter over time.
How much does it cost to fix?▼
The cost to fix P2237 typically ranges from $50 to $150 for a DIY replacement of the O2 sensor, or $150 to $300 if professionally installed.