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Mode 05 • PID 109

OBD2 PID 05109

O2 Sensor Monitor Bank 3 Sensor 1

Definition

Mode
05 (hex)
PID
109 (hex)
Data bytes
Formula
0.005 Rich to lean sensor threshold voltage
Range
0 – 1.275 Volts
Units
Volts

How to read PID 05109

Send mode 05 with PID 109 over OBD-II. The ECU returns data byte(s), decoded with 0.005 Rich to lean sensor threshold voltage (A, B, C, D are the returned bytes in order). The result is “O2 Sensor Monitor Bank 3 Sensor 1” in Volts. This is standard SAE J1979 data supported by most OBD-II scan tools and loggers.

Why it matters for tuning

Live PIDs like this are how tuners and workshops verify a remap on the road — logging RPM, load, boost, lambda and temperatures to confirm the map is safe. The desktop Softechpro Solutions software complements live logging with offline ECU editing: DPF/EGR/AdBlue/DTC off and Stage tuning with automatic checksum.

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