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What are the reasons for a vehicle displaying sensor failure?

1 Answers

DeFaith

07/25/25 3:54am

Vehicle displaying sensor failure is caused by blockage from elastic force or obstruction of the oxygen sensor's atmospheric vent by dust and engine oil. Below are the specific details: 1. Blockage by elastic force: In this case, the oxygen sensor's signal voltage will be higher, prompting the engine computer to issue a command to reduce fuel injection, resulting in an overly lean air-fuel mixture. Check whether the three-way catalytic converter is functioning properly and if there is any blockage. Verify if the spark plugs and ignition coil are operating at normal voltage. 2. Obstruction of the oxygen sensor's atmospheric vent by dust and engine oil: Here, the oxygen sensor's signal voltage will be lower, causing the engine voltage to instruct the fuel injector to inject more fuel, leading to an overly rich air-fuel mixture.

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