The P2235: O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2 refers to an electrical issue where the oxygen (O2) sensor signal circuit has an unintended short to the heater circuit for Bank 2 Sensor 2. This type of fault can prevent the sensor from delivering accurate data to the engine control module, leading to improper air-fuel mixture control, reduced engine performance, and increased emissions. The cause may be related to a faulty O2 sensor, issues with the wiring, or connector problems.
P2235 – Quick Overview
Code | Information |
---|---|
Meaning | P2235: O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2 |
Is it serious? | Yes, as improper O2 sensor readings can lead to incorrect air-fuel mixture, reduced fuel efficiency, and increased emissions. |
Possible causes | – Short circuit between O2 sensor signal and heater circuit in Bank 2 Sensor 2 – Faulty O2 sensor – Wiring issues – Connector problems |
How to diagnose? | – Inspect the O2 sensor signal circuit for shorts – Test the O2 sensor and heater circuits – Check wiring and connectors for faults |
P2235 Meaning
The P2235: O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 2 code indicates that there is a short circuit between the oxygen sensor’s signal circuit and its heater circuit for Bank 2 Sensor 2. This type of malfunction prevents the oxygen sensor from properly monitoring exhaust gases and communicating accurate oxygen levels to the engine control unit, leading to incorrect air-fuel mixture control, poor fuel economy, and increased exhaust emissions.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to see if any additional related codes are present. These can help identify whether this is an isolated issue or part of a larger problem. | OBD-II Scanner |
Inspect the O2 Sensor Signal Circuit for Shorts | Perform a visual inspection of the wiring for Bank 2 Sensor 2. Look for signs of damage such as melted wires, frayed insulation, or areas where the signal and heater wires may have contacted each other, resulting in a short circuit. | Flashlight, Safety Gloves |
Test the O2 Sensor and Heater Circuits | Use a multimeter to measure the resistance of both the O2 sensor signal and heater circuits. Verify that there is no continuity between these circuits, which would indicate a short. Compare the readings against the manufacturer’s specifications for any deviations. | Multimeter, Vehicle Service Manual |
Check Wiring and Connectors for Faults | Inspect the connectors and all associated wiring leading to the O2 sensor. Look for bent pins, corrosion, or loose connections that may be causing the short. Replace or repair any connectors or wiring as needed. | Flashlight, Multimeter, Safety Gloves |
Test the O2 Sensor | Test the O2 sensor itself to determine if there is an internal short between the heater and signal circuits. If the O2 sensor is found to be defective, replace it to restore proper function. | Multimeter, Diagnostic Tool |
Clear the Code and Test Drive | After repairs have been completed, clear the code using an OBD-II scanner. Conduct a test drive to verify that the issue is resolved, while monitoring the O2 sensor readings for consistency. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, use the OBD-II scanner again to verify that the P2235 code has not reappeared. If the code returns, further diagnostic investigation may be necessary. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)