Does a module positioned for monitoring in the diagnostic port affect the car's computer and running?

Asked by Jul 27, 2016 at 03:04 PM about the 2002 BMW 3 Series 325i

Question type: Maintenance & Repair

I have a USAA monitoring module connected to my diagnostic port. My 325i sporadically idles down and cuts of at stop lights. It starts immediately but then idles down and cuts off (very embarrassing at stop lights!). By starting and revving the engine, I can eventually keep the car running and limp the car home. BMW dealer cannot diagnostically locate the problem. Can the USAA module be affecting the car's computer system?

2 Answers

11,735

Shame on that BMW dealer that can't hire a decent trained tech. The J1962 connector isn't the issue. having a monitor (INSURANCE COMPANY) plugged in does nothing unplug it and learn first hand. The vehicle has a malfunction. BMW, PC based O.S.S and they can't locate the issue ridiculous. I see this day after day guys can't operate computers or scan tools.

Check your codes if CEL is on. Most likely something to do with you MAF sensor or a vac.leak. Other than taking it to another shop, you can try unplugging your MAF sensor for testing purposes (will throw check engine light, but I'm assuming is already on) and see if the behavior improves. If that doesn't change things, the oil separator hose that goes to the oil dip stick may deteriorate causing a vacuum leak.

Your Answer

Add photo

Related Questions

Search BMW 3 Series Questions

BMW 3 Series Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,550
#2 Robert Charlson
Robert Charlson
Reputation 1,520
#3 Matt Mankinen
Matt Mankinen
Reputation 1,180
View All

Related Models For Sale

Used BMW 5 Series
512 Great Deals out of 15,622 listings starting at $2,499
Used BMW M3
40 Great Deals out of 1,702 listings starting at $4,544
Used Mercedes-Benz C-Class
480 Great Deals out of 28,810 listings starting at $1,499
Used Audi A4
184 Great Deals out of 10,891 listings starting at $700
Used Ford Mustang
396 Great Deals out of 47,365 listings starting at $1,999
Used BMW 6 Series
77 Great Deals out of 3,255 listings starting at $6,995
Used Chevrolet Camaro
151 Great Deals out of 32,742 listings starting at $1,729
Used Mercedes-Benz E-Class
371 Great Deals out of 21,760 listings starting at $699
Used Honda Accord
789 Great Deals out of 88,192 listings starting at $1,150
Used BMW 7 Series
196 Great Deals out of 6,107 listings starting at $2,999
Used BMW X5
458 Great Deals out of 16,763 listings starting at $2,000

Used Cars For Sale

2017 BMW 3 Series For Sale
44 Great Deals out of 8,298 listings starting at $27,996
2016 BMW 3 Series For Sale
143 Great Deals out of 3,445 listings starting at $19,995
2015 BMW 3 Series For Sale
19 Great Deals out of 949 listings starting at $15,999
2014 BMW 3 Series For Sale
204 Great Deals out of 4,432 listings starting at $11,980
2013 BMW 3 Series For Sale
90 Great Deals out of 2,854 listings starting at $11,950