What is the P0135 fault code?
1 Answers
P0135 fault code indicates an issue with the oxygen sensor heater circuit. This code appears if the current consumption exceeds the calibrated limit, or if an open or short circuit is detected. Possible causes include: 1. Oxygen sensor heater circuit. 2. Connector failure. 3. Oxygen sensor malfunction. 4. Electronic control module failure, etc. Additional information: 1. The sensitive element in the oxygen sensor that generates the voltage signal is made of zirconium dioxide, coated with a layer of platinum, which is further protected by a ceramic layer. 2. The inner side of the oxygen sensor's sensitive element is exposed to the atmosphere, while the outer side is exposed to the engine's exhaust gases. When the temperature exceeds 300°C, a significant difference in oxygen content between the two sides generates an electromotive force.