O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 1
The P2253 code indicates that the powertrain control module (PCM) has detected a high voltage or resistance in the negative current control circuit of the oxygen sensor located before the catalytic converter on Bank 1. This circuit is responsible for regulating the sensor's heater and bias voltage. A high condition suggests an open circuit, short to voltage, or a 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: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the O2 sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the sensor's heater circuit resistance with a multimeter (should be between 2-10 ohms).
Step 4: Check for voltage at the sensor connector with the key on (should be battery voltage on the heater circuit).
Step 5: If all checks pass, replace the oxygen 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 oxygen sensor. Professional labor may add $50-$100.