OBD LensSecondary oxygen sensor short-term fuel trim
Secondary oxygen sensor short-term fuel trim is the label for this direct standard PID entry in the shared App definitions. Interpret the value using its reported unit and your vehicle’s service information.
PID: 01 55
Stable key: 01-55
Short name: 二次 STFT
Unit: Structured status or no scalar unit specified
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These are source definitions, not evidence that every ECU returns a valid value. No data is different from zero.
Understand the code. Then follow your own data.
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