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09 pilot cats

  • Dr. Seydel
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14 Aug 2019 09:15 #32810 by Dr. Seydel
09 pilot cats was created by Dr. Seydel
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

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  • Tyler
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14 Aug 2019 20:26 #32822 by Tyler
Replied by Tyler on topic 09 pilot cats
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:

www.scannerdanner.com/forum/diagnostic-t...-testing-thread.html

What are the downstream O2's and fuel trims doing during a test drive?

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14 Aug 2019 21:57 #32824 by Dr. Seydel
Replied by Dr. Seydel on topic 09 pilot cats
Thanks for the reply
My modis only shows bank 1sensor 1 and bank 2 sensor 1. Doesn’t show downstream sensor 2. I’ll keep playing with it
Thanks

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17 Aug 2019 11:11 #32879 by Tyler
Replied by Tyler on topic 09 pilot cats
Really? :huh: It may not be called downstream, or B1S2/B2S2 like we're used to.

Most of the time I see the downstream sensors labeled "HO2S S2" in the Snap-On software.

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