O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 1
The P2252 code indicates that the powertrain control module (PCM) has detected a low voltage or current condition in the negative current control circuit of the oxygen sensor located upstream of the catalytic converter on Bank 1 (engine side with cylinder #1). This circuit is responsible for regulating the sensor's heater and bias voltage. A low signal suggests a short to ground, open circuit, or faulty sensor, which can affect air-fuel ratio readings and emissions.
01. Most Common Causes
- Faulty oxygen sensor (Bank 1 Sensor 1)
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Blown fuse or relay for the O2 sensor heater
- PCM failure (rare)
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 additional codes and freeze frame data.
Step 2: Visually inspect the O2 sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check the sensor's heater circuit resistance and voltage (typically 12V with key on).
Step 4: Test the sensor signal voltage (should fluctuate between 0.1-0.9V).
Step 5: If wiring and voltage are normal, replace the O2 sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor fuel economy and increased emissions. Prolonged driving could damage the catalytic converter.
How much does it cost to fix?▼
Typically $50-$150 for a DIY replacement of the O2 sensor. Professional repair including diagnosis and labor may cost $150-$300.