O2 Sensor Signal Shorted to Heater Circuit Bank 2 Sensor 2
The P2235 code indicates a short circuit between the oxygen sensor signal wire and the heater circuit for Bank 2 Sensor 2 (downstream sensor). This can cause incorrect voltage readings, leading to improper air-fuel mixture adjustments and potential catalytic converter damage. The short may be internal to the sensor or in the wiring harness.
01. Most Common Causes
- Faulty oxygen sensor (internal short)
- Damaged wiring or connector (chafed, melted, or corroded)
- Heater circuit short to signal wire due to insulation breakdown
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Failed emissions test
- Possible rough idle or hesitation
03. 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, corrosion, or melted insulation.
Step 3: Disconnect the sensor and measure resistance between heater pins and signal pin; a short indicates a faulty sensor.
Step 4: Check for continuity between signal wire and heater circuit in the harness; repair or replace as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor fuel economy and potentially damage the catalytic converter. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $150 to $300, including parts and labor. The sensor itself costs $50-$150, and labor adds $50-$150.