O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2
What it means
P2235 means the signal wire of the bank 2, sensor 2 oxygen sensor is shorted to its own heater circuit. This is the downstream (post-catalytic-converter) sensor, so its main job is checking converter efficiency rather than controlling the fuel mixture — the engine usually drives normally. The typical cause is a wiring fault: harness insulation chafed or melted against the hot exhaust, letting the signal and heater wires touch. A failed sensor or corroded connector are the other suspects.
Can I keep driving? Drivable — this is a downstream (post-cat) sensor, so it mainly affects emissions monitoring rather than how the car runs.
Common symptoms
What you'll notice
- Check-engine light on
- Usually little or no change in how the car drives
- Possible slightly higher fuel consumption
- May fail an emissions test
Common causes
Most likely first
- O2 sensor harness chafed or melted, shorting the signal wire to the heater wire against hot exhaustLikely
- Faulty oxygen sensor (bank 2, sensor 2)Common
- Corroded or damaged connector at the sensorCommon
- Wiring routed too close to the exhaustLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for companion O2 sensor codes.
- Inspect the bank 2, sensor 2 harness for melted, chafed, or pinched insulation shorting the signal and heater wires together.
- Check the sensor connector for corrosion or damage.
- Measure the signal and heater circuits to confirm they're shorted, and re-route wiring clear of the exhaust.
- Replace the O2 sensor if the short is internal. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2235?+
Can I just clear P2235?+
Related codes
Often seen with P2235
Read & clear P2235 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.