Osf abs fault

ninaandphil · 27th March 2023, 20:41

Hi all. I have both my ABS warning light and my brake warning light on, the screen reads ABS fault & brake fault on start up. The ABS warning light does not go out, so this points to an electrical fault or less likely a modulator fault. I have read the OBD and the only fault shown is front ABS sensor. The problem started when my front offside wheel arch liner decided to detach itself, taking out the ABS wire on it's way. I have replaced the sensor lead twice. The first lead was a cheapo unit and did not fix the issue, the speedo was also out. I bought a Bosch sensor, the speedo started working bit the lights remain on. The voltages read 12V & 1.6V, which seem correct, so I am puzzled if there is a break in the circuit? Today the speedo seems to be unstable, it starts off on a journey OK, but then only moves between 0-30MPH, even when doing 60! The speedo needle is just hovering up and down randomly at this speed range. I need some help on where to look and what might be causing this speedo issue! Thanks for any expert advice. I also checked the voltages when I got home and these seemed high at close to 14V with the return at 2.4v?

vitesse · 27th March 2023, 21:28

Haven't a clue what front off side is, but as you're talking about your speedometer then it's the front right ABS sensor. However the sensor is only half of the circuit, the other half is the magnetic strip forming part of the bearing perhaps it's damaged either by rust flakes or debris from an old sensor.

It's not a fun job but I'd take the hub off and examine the magnetic strip, could also be that the ABS sensor isn't fully within range and needs trimming.

Regards

Ducati750cc · 28th March 2023, 00:52

Quote:

Originally Posted by vitesse

Haven't a clue what front off side is, but as you're talking about your speedometer then it's the front right ABS sensor. However the sensor is only half of the circuit, the other half is the magnetic strip forming part of the bearing perhaps it's damaged either by rust flakes or debris from an old sensor.

It's not a fun job but I'd take the hub off and examine the magnetic strip, could also be that the ABS sensor isn't fully within range and needs trimming.

Regards

Hi Vitesse, in the UK, being a drive on the left country, the front offside refers to the side where the driver sits, the nearside being next to the curb / pavement.

But as you say "the front right " it is the same as our offside, your " front left" would be our nearside.

vitesse · 28th March 2023, 08:05

Thanks, it's been explained before but I instantly forget as you then have to factor in the poster's originating country and whether they drive on the right or left.

Think it would be a lot easier if everyone sticks to the simpler "front right or front left"

Regards

Arctic · 28th March 2023, 09:27

Quote:

Originally Posted by vitesse

Thanks, it's been explained before but I instantly forget as you then have to factor in the poster's originating country and whether they drive on the right or left.

Quote:

Think it would be a lot easier if everyone sticks to the simpler "front right or front left"

Regards

Hi Mike.
Even then you have to take into account that the right means when you are sitting in the car not standing in front of the car, same for the left.

Some people make the mistake of thinking when referring to left and right from the front of the car, when in fact it's from the rear of the car.

vitesse · 28th March 2023, 10:15

True Steve, but it's impossible to factor in everyone's variables

Just trying to point out that left & right are internationally accepted standards, think it even mentions this in the workshop manual. Funny though that UK seems to be the only place that uses the nsf/osf and thankfully so because if I start using the same terminology about a car locally (in Sweden) it would be really confusing.

Keep well,

Mike

stocktake · 28th March 2023, 10:37

bigblue75 · 28th March 2023, 12:04

Just wondering if the OP ever found / fixed the cause of the uneven power delivery they asked about in another thread.....

personally, I've always considered front, left / right, rear as when sitting in the car facing the correct way.

Mike Noc · 28th March 2023, 12:31

Maybe we should use port and starboard - then there is no confusion.

ninaandphil · 28th March 2023, 17:15

Hi, sadly I have not cured the uneven power delivery yet! I put in a new MAF, which actually has dramatically improved the low rpm driving, but in the background, not all the time, are the annoying performance 'hiccups', I have also changed the diesel fuel filter. I am wondering if there might be some voltage stability issues with the car, I can only think of this, and or a front or rear fuel pump not delivering a consistent flow, doesn't feel severe enough to be fuel starvation.

And thanks for all the comments regarding OSF! I think I'll stick to RHD drivers front to avoid confusion. (The one with the speedo on diesels).

What I really need is inspiration on my ABS & Brake light and wonky at times speedo. I don't think the issue is dirt or reluctor ring related as the ABS lights stay on and doesn't go out, then back on, but who knows :-) Anyone think voltage stability from the alternator might be an issue?

Such a lovely car but the niggles are driving me mad!

27th March 2023, 20:41	#1
ninaandphil Avid contributor MG ZT CDTi Join Date: May 2013 Location: Exford Posts: 173 Thanks: 49 Thanked 25 Times in 20 Posts	Osf abs fault Hi all. I have both my ABS warning light and my brake warning light on, the screen reads ABS fault & brake fault on start up. The ABS warning light does not go out, so this points to an electrical fault or less likely a modulator fault. I have read the OBD and the only fault shown is front ABS sensor. The problem started when my front offside wheel arch liner decided to detach itself, taking out the ABS wire on it's way. I have replaced the sensor lead twice. The first lead was a cheapo unit and did not fix the issue, the speedo was also out. I bought a Bosch sensor, the speedo started working bit the lights remain on. The voltages read 12V & 1.6V, which seem correct, so I am puzzled if there is a break in the circuit? Today the speedo seems to be unstable, it starts off on a journey OK, but then only moves between 0-30MPH, even when doing 60! The speedo needle is just hovering up and down randomly at this speed range. I need some help on where to look and what might be causing this speedo issue! Thanks for any expert advice. I also checked the voltages when I got home and these seemed high at close to 14V with the return at 2.4v?

28th March 2023, 10:37	#7
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,607 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	__________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

28th March 2023, 12:04	#8
bigblue75 older not wiser 75 Tourer Join Date: Oct 2014 Location: Falkirk Posts: 280 Thanks: 93 Thanked 46 Times in 35 Posts	Off topic but Just wondering if the OP ever found / fixed the cause of the uneven power delivery they asked about in another thread..... personally, I've always considered front, left / right, rear as when sitting in the car facing the correct way.

28th March 2023, 17:15	#10
ninaandphil Avid contributor MG ZT CDTi Join Date: May 2013 Location: Exford Posts: 173 Thanks: 49 Thanked 25 Times in 20 Posts	Hi, sadly I have not cured the uneven power delivery yet! I put in a new MAF, which actually has dramatically improved the low rpm driving, but in the background, not all the time, are the annoying performance 'hiccups', I have also changed the diesel fuel filter. I am wondering if there might be some voltage stability issues with the car, I can only think of this, and or a front or rear fuel pump not delivering a consistent flow, doesn't feel severe enough to be fuel starvation. And thanks for all the comments regarding OSF! I think I'll stick to RHD drivers front to avoid confusion. (The one with the speedo on diesels). What I really need is inspiration on my ABS & Brake light and wonky at times speedo. I don't think the issue is dirt or reluctor ring related as the ABS lights stay on and doesn't go out, then back on, but who knows :-) Anyone think voltage stability from the alternator might be an issue? Such a lovely car but the niggles are driving me mad! Last edited by ninaandphil; 28th March 2023 at 17:19..

27th March 2023, 21:28	#2
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,575 Thanks: 395 Thanked 823 Times in 652 Posts	Haven't a clue what front off side is, but as you're talking about your speedometer then it's the front right ABS sensor. However the sensor is only half of the circuit, the other half is the magnetic strip forming part of the bearing perhaps it's damaged either by rust flakes or debris from an old sensor. It's not a fun job but I'd take the hub off and examine the magnetic strip, could also be that the ABS sensor isn't fully within range and needs trimming. Regards

28th March 2023, 08:05	#4
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,575 Thanks: 395 Thanked 823 Times in 652 Posts	Thanks, it's been explained before but I instantly forget as you then have to factor in the poster's originating country and whether they drive on the right or left. Think it would be a lot easier if everyone sticks to the simpler "front right or front left" Regards

28th March 2023, 10:15	#6
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,575 Thanks: 395 Thanked 823 Times in 652 Posts	True Steve, but it's impossible to factor in everyone's variables Just trying to point out that left & right are internationally accepted standards, think it even mentions this in the workshop manual. Funny though that UK seems to be the only place that uses the nsf/osf and thankfully so because if I start using the same terminology about a car locally (in Sweden) it would be really confusing. Keep well, Mike

28th March 2023, 12:31	#9
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,584 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Maybe we should use port and starboard - then there is no confusion.