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Car has AF sensors and only gives bank 1 bank2 values of 1.00 for each. Where are bank sensor 2 values? I never felt with Lamda before. Help! Dealer says both cats are bad.
Guy
Hey Dr. Seydel! Are you looking at Global OBD data, or OEM data?
Lambda values of 1.00 from the upstream air/fuel sensors indicate stoichiometric, as long as you're in closed loop. If you have a sensor current PID (in mA), it'll show zero at stoichiometric. Lambda values above 1.00 indicate lean, lower indicate rich. Our air/fuel ratio sticky has tons of information on the subject:
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