On my Techstream as a Toyota mechanic, when connected to the ECU, I can command the fuel ratio lean or rich in fine increments. It's used for diagnostic purposes to see if when you command more or less fuel, do the A/F and O2 sensors respond correctly. Helps troubleshooting a lot.
@@dynaway You can see your efficiency indicators are showing an internal combustion issue. CO2 is 5% below and 02 is 5% high, the root cause seems to be a lean condition. Lambda is 1.22 meaning lean and C02 & O2 are verifying that.
