Brakes: 850: - Abs fault code 121

dazbooker · Dec 20th, 2022, 19:27

Can anyone tell me what could cause abs fault code 121 on a 1995 t5r with obd1

volvo again · Dec 21st, 2022, 17:29

Left hand front wheel sensor...

May be just dirty, loose/dirty connection or faulty sensor.
Or may be caused by cracked or damaged reluctor ring.

dazbooker · Dec 21st, 2022, 20:14

Could an intermitant open circuit in the wiring cause this code

SwedishBus · Dec 21st, 2022, 22:31

Quote:

Originally Posted by dazbooker

Could an intermitant open circuit in the wiring cause this code

Yes, that would be one thing to eliminate first.

I would look very hard at the reluctor ring - lots of these are going, but they are easy to fix with a new ring - very difficult to diagnose without a means of looking at the raw signal out of the sensor (oscilloscope) because the rings can crack internally.....

Dec 20th, 2022, 19:27	#1
dazbooker Senior Member Last Online: Apr 25th, 2024 22:02 Join Date: Jan 2014 Location: barnsley	Abs fault code 121 Can anyone tell me what could cause abs fault code 121 on a 1995 t5r with obd1

Dec 21st, 2022, 17:29	#2
volvo again Master Member Last Online: Today 14:56 Join Date: Jun 2018 Location: Presteigne, mid Wales	Left hand front wheel sensor... May be just dirty, loose/dirty connection or faulty sensor. Or may be caused by cracked or damaged reluctor ring. __________________ 1998 V70 2.5 Auto & Supercharged Mercedes C Class... Last edited by volvo again; Dec 21st, 2022 at 17:31.

Dec 21st, 2022, 20:14	#3
dazbooker Senior Member Last Online: Apr 25th, 2024 22:02 Join Date: Jan 2014 Location: barnsley	Could an intermitant open circuit in the wiring cause this code

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