Performing a involves rewriting the factory calibration data. Here’s what a typical update includes:

The UPD system has a small foam filter inside the fuel tank or along the vent line. If a spider webs, dust, or fuel residue blocks this filter, pressure readings become erratic, triggering P69B.

Do not ignore P69B. Driving with a faulty UPD sensor can lead to fuel tank deformation (if vent gets blocked) or failed emissions inspection.

Replace engine oil and the oil filter every 7,500 to 20,000 km .