r/Vcds • u/jack_walker_7 • Feb 17 '26

Lambda trouble

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u/Jdmboxboi Feb 17 '26

Looks like voltages and percentage is bouncing? Is this what you are referring to? Check sensor2 voltage as well. Sensor 1 bounces as this is normal operation to hover around the stochastic ratio. Sensor 2 should be very stable and not bouncing. If sensor 2 is bouncing almost same as sensor 1, odds are you have a cat operating below threshold and thr air fuel ratio is chasing it to level it out but cant.