What Does P2236 Mean?
The downstream oxygen sensor on Bank 2 (Sensor 3, post-catalyst) has a short between signal and heater circuits. This is typically caused by sensor internal failure or wiring damage.
Common Causes
65%
Failed oxygen sensor with internal short between signal and heater elements
20%
Damaged wiring harness from heat or abrasion near exhaust system
10%
Corroded or damaged sensor connector with short circuit path
5%
PCM internal circuit damage
Diagnostic Steps
1
Perform visual inspection of O2 sensor and wiring for heat damage or physical wear
2
Disconnect sensor connector and test for continuity between signal and heater circuits (should be infinite resistance)
3
Check connector for corrosion, water intrusion, or damaged pins
4
Replace oxygen sensor if internal short is confirmed by testing
5
Clear codes and road test to confirm proper operation
Estimated Repair Cost
$150 - $400
Parts + labor, varies by vehicle and location
The downstream oxygen sensor on Bank 2 (Sensor 3, post-catalyst) has a short between signal and heater circuits. This is typically caused by sensor internal failure or wiring damage.
The most common cause of P2236 (O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 3) is: Failed oxygen sensor with internal short between signal and heater elements
Typical repair costs for P2236 range from $150 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but emissions system monitoring is compromised. Will result in emissions test failure and check engine light.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2236 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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