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What does the P1116 fault code mean for the 2009 Jetta?

1 Answers

StKira

07/30/25 4:27am

The P1116 fault code for the 2009 Jetta indicates an open circuit in the heated oxygen sensor heater circuit, meaning the sensor has malfunctioned. Causes and solutions for the fault: The causes of the fault include issues with the oxygen sensor itself, its circuit or connectors, leaks in the exhaust manifold or pipe, or faults in the electronic control module. During routine maintenance of the car engine, it is essential to use high-quality lubricating oil, regularly change the oil and filter, ensure good ventilation in the crankcase, and perform regular cleaning. Solution: Check the oxygen sensor and its resistance. In most cases, the sensor is damaged and can be replaced at a 4S shop. Function of the car oxygen sensor: The car oxygen sensor is used to measure the oxygen content in the engine exhaust to adjust the fuel injection, thereby achieving the optimal air-fuel ratio for the car's engine.

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