Toyota Avensis 2004–2008 O2 Sensor Replacement | Fix P0031 + VSC/TRC C1201

In this video I show how to diagnose and replace a faulty O2 (oxygen) sensor on a Toyota Avensis 2004–2008. If your Avensis is showing fault code P0031 (Oxygen Sensor Heater Control Circuit Low) along with VSC and TRC OFF lights and fault code C1201, it is often caused by a failed upstream O2 sensor. This step-by-step guide shows how to locate the sensor, remove it, install a new one, and clear the fault codes. This applies to many Toyota Avensis T25 petrol engines, including 1.6, 1.8, and 2.0 VVTi models. WHAT’S INCLUDED: Symptoms of a faulty O2 sensor Why P0031 triggers VSC/TRC warning (C1201) How to locate the upstream oxygen sensor Safely removing the old sensor Installing the new O2 sensor Clearing engine and VSC/TRC codes Checking live data to confirm repair TOOLS & PARTS USED : Upstream O2 / A/F ratio sensor O2 sensor socket - Look on ebay for genuine second hand Penetrating oil - https://amzn.to/4j2aoV5 Ratchet and extensions - https://amzn.to/3XQ7by7 OBD2 scanner - https://amzn.to/3MWhcHG Gloves - https://amzn.to/4pzgkaI Eye protection - https://amzn.to/4iYaFsi Torch - https://amzn.to/4q3Dupg HEALTH & SAFETY TIPS WHEN WORKING ON CARS: Allow the exhaust to cool completely before starting Wear gloves and eye protection Secure the vehicle properly if raised Use penetrating oil to avoid snapping seized sensors Keep tools clear of hot components Always confirm correct sensor part numbers AFFILIATE & RESPONSIBILITY DISCLAIMER: Some links in this description may be Amazon affiliate links, meaning I may earn a small commission at no extra cost to you. Any work you carry out on your vehicle is at your own risk. I accept no responsibility for injuries, damage, or incorrect repairs. Always follow Toyota’s official procedures and confirm correct torque settings for your engine. 🔖 Hashtags #toyotaavensis #avensis #o2sensor #oxygenSensor #p0031 #c1201 #toyotarepair #mechanic #carrepair #diycars #maintenance