What Does P2235 Mean?
The signal circuit of the post-catalyst oxygen sensor on Bank 2 (Sensor 2) is shorted to its heater circuit. This disrupts proper catalytic converter efficiency monitoring.
Common Causes
65%
Failed oxygen sensor with internal short between signal and heater circuits
20%
Heat-damaged wiring harness causing wire-to-wire short
10%
Corroded connector terminals allowing electrical cross-talk
5%
PCM driver circuit malfunction
Diagnostic Steps
1
Inspect sensor and wiring for physical damage or heat exposure from exhaust
2
Disconnect O2 sensor and measure resistance between signal pin and heater pins; should read open circuit
3
Examine connector for moisture intrusion, corrosion, or melted plastic
4
Replace O2 sensor if internal short is detected
5
Verify repair by monitoring live data for proper sensor operation
Estimated Repair Cost
$150 - $400
Parts + labor, varies by vehicle and location
The signal circuit of the post-catalyst oxygen sensor on Bank 2 (Sensor 2) is shorted to its heater circuit. This disrupts proper catalytic converter efficiency monitoring.
The most common cause of P2235 (O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2) is: Failed oxygen sensor with internal short between signal and heater circuits
Typical repair costs for P2235 range from $150 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but catalyst monitoring is disabled. Will trigger check engine light and cause emissions test failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2235 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
