What is the reason for the 'Check Engine' light appearing after starting the Bestune T77?

1 Answers
JudeRose
07/30/25 3:49am
Possible reasons for the 'Check Engine' light appearing after starting the Bestune T77 are as follows: 1. Issues with the car's engine cooling system; 2. Thermostat failure; 3. Problems with the oxygen sensor; 4. The vehicle's exhaust emissions do not meet standards; 5. Issues with the gasoline, etc. Here are the solutions: 1. Determine if the engine is working properly by checking the long-term and short-term fuel trim values and the injection pulse width. 2. Determine if the engine is working properly by checking the oxygen sensor's output voltage and change frequency. 3. Diagnose car faults through exhaust emission test data.
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