Catalyst Temperature Sensor Circuit Malfunction (Bank 2, Sensor 1)
The P0435 code indicates a malfunction in the catalyst temperature sensor circuit for Bank 2, Sensor 1. This sensor monitors the temperature of the catalytic converter to ensure it is operating efficiently and to protect it from overheating. The Powertrain Control Module (PCM) detects an abnormal voltage or resistance in the sensor circuit, which can be caused by a faulty sensor, wiring issues, or a problem with the PCM itself. This code is often accompanied by other catalyst-related codes and can lead to reduced emissions control and potential catalytic converter damage if ignored.
01. Most Common Causes
- Faulty catalyst temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor or PCM
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible decrease in fuel economy
- Failed emissions test
- Possible catalytic converter overheating (rare)
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the wiring and connector for Bank 2, Sensor 1 for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage output using a multimeter and compare to manufacturer specifications.
Step 4: If the sensor and wiring are okay, check the PCM for faults or perform a circuit continuity test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but prolonged driving may risk catalytic converter damage due to unmonitored temperatures. It is best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and labor rates. DIY replacement can be cheaper.