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Old 04-06-2019, 11:40 AM
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Default 2013 335is won't pass readiness

Been trying for almost a month I have done the recommended drive cycles multiple time and have at least 20 cold starts and close to 1000 miles.

I cannot get O2 and cat to clear and go ready. From what I've read both rely on looking at the lambda sensors and post cat that at least points me to ok there first. Car did have JB4 on it but I've removed hoping something was interfering. I have BMW tools and Rheihngold and have dug around but sensorsnlook fine in INPA.

Looking for help with how to proceed verifying what's going on. I thought about just shotgun replacement of all O2s but would like to verify if on is lazy. I do have Testo so I can log the lambda and o2 but having issues getting that to connect.


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Old 04-06-2019, 12:14 PM
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Also someone had mentioned to check for a back end flash(BEF) since a lot of folks put jb4s on these cars. I did not do a BEF. Is there any way to tell in one of the tool suites? Looks like a program called MHD can see that.
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