What it means
The oxygen sensor signal circuit is shorted to its heater circuit on Bank 2 Sensor 2. This electrical fault can make the sensor reading unreliable.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 2 is the oxygen sensor downstream of the catalytic converter on Bank 2, the bank opposite Bank 1. P2235 indicates that this sensor's signal circuit is shorted to its heater circuit, so its downstream exhaust reading is unreliable and catalyst or emissions monitoring may be affected.
Common causes
Most likely first.
- Signal wire shorted to the sensor heater wire
- Melted or damaged sensor wiring
- Damaged or contaminated connector
- Internal oxygen sensor fault
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Save freeze-frame data and review Bank 2 Sensor 2 live data and related catalyst-monitor information for an implausible reading.
- With the exhaust cool, inspect the downstream Bank 2 sensor wiring and connector for melted insulation, chafing, contamination, or corrosion.
- Use the vehicle wiring diagram to identify the Bank 2 Sensor 2 signal and heater circuits and check for a short between them.
- Test the harness and connector separately from the sensor to determine whether the fault is in the wiring or sensor.
- If these checks pass, follow the manufacturer's diagnostic procedure to test the controller input circuit.
Common fixes
- Repair melted or chafed Bank 2 Sensor 2 wiring.
- Clean or repair corroded or contaminated connector terminals.
- Replace Bank 2 Sensor 2 if its internal circuits are shorted.
- Repair a controller input fault only if testing confirms it.
Can I keep driving?
A short trip is generally possible if the engine runs normally, but arrange repair soon because Bank 2 emissions monitoring may be impaired and the vehicle may fail an emissions test. Stop if engine performance becomes significantly worse.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.