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If someone brings their car in due to runnability issues requiring the vehicle be run through diagnostics THEN everything that has been changed on the car that could/might have a remote connection to the problem with the car ...... will be noted. This information is also uploaded to BMWNA automatically as soon as diagnostics are started.
I brought my car in a while back for a CEL issue. Catted DPs, FMIC, exhaust & intake installed. Diagnostics were run, BMWNA informed my dealer that car would have to be returned to stock to perform proper diagnostics.
No worries, no problem. BMWNA knows my car intimately at this point. Full warranty remains intact.
I installed an O2 simulator and all is well in my world.
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