bf mkII fault U0121

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Joined: Sun Aug 02, 2009 9:16 pm
Location: Bayside, Melbourne, Victoria

Re: bf mkII fault U0121

Postby VX L67 Getrag » Wed Jul 31, 2019 5:51 pm

It's strange I thought the VIN was in either block1 or block2 but doesn't seem to be in there & wonder if they do have that info in there at all & whether linking is an issue.

Posts: 2433
Joined: Sun Aug 02, 2009 9:16 pm
Location: Bayside, Melbourne, Victoria

Re: bf mkII fault U0121

Postby VX L67 Getrag » Fri Aug 23, 2019 7:34 am

OK so a bit of an update... I was pretty sure the speed signal is taken from the front left & that had a different size wheel to other 3 so I changed it & made no difference.

I got another ABS module & programmed info from my other abs module & still the exact same issue.

The other strange thing is it seems to not happen as much after driving for more than 20 minutes, if I do a reset at that point sometimes the speedo stays working for 10+ minutes, but when it does fail the 3 lights flash on the dash(brake fail/TCS & ABS) the speedo stays on that speed for 2 seconds & then drops to nothing.

The other weird thing it does that I haven't figured out yet is from the rear right especially at lower speeds there is a chatter type noise & not sure whether that is the diff, driveshaft or speed sensor/abs issue?

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