hi all. i have a panda 56 plate and have been having issues with abs.
the front sensors were replaced with new, then i found out about testing ohms, and the rear wasn't reading anything so i replaced these and still have the abs light on.
when testing the sensors the rear are 492 and 452 and the front are 452 and 352 ohms.
would these reading be normal? the 352 is the drivers side.
iv'e run out of ideas with this and would appreciate any help.
i replaced the faulty gearbox with one from a 52 plate punto about 3 months ago but i cant remember when this abs light came on.

What error codes is it reading?

The codes were something like, u500 u1600 I cleared them and no codes have come back only abs light..
The obi 11 said vehicle sensor. And that was it

I'd check the one (and it's connectors) that reads 350 Ohms.

gr J

I’ve checked the one that 352 ohms and connections and it still reads 352 and connection is good..
When this connection was removed the speedo didn’t work or power steering but rev counter did. When the new sensor was put on everything worked apart from abs.

You need a registered version of www.multiecuscan.net and a full OBD cables set.

Because the vehicle is no longer registering any fault codes, would a Multiecuscan find the problem?

We may need some history before the ABS light first illuminated.
Had you only recently acquired the car, or had you had it a while?
Has anything else been replaced, adjusted or otherwise attended to?

Wheel bearings can sometimes be put in back to front, placing the ABS reluctor away from the sensor.
Testing the sensor may not show issues with wiring from there to the ECU.

MES should show specifically which corner is an issue, which can help focus one's attention. Jack up that side, spin the wheel and see if a signal is received. Might be an idea to compare with the other side if you can spin it at a similar speed.

Tizzywizzy1uk said:

Because the vehicle is no longer registering any fault codes, would a Multiecuscan find the problem?

Click to expand...

you can plot the live data from each wheel simultaneously

or you could set a multi meter to ac. Spin the wheel the faster it spins the higher the volts

Wow, thanks for the suggestions..
I have a full set of cables and adapter on order, .. meanwhile I’ll do the other checks that have been suggested.
I’ll let you know how I get on.
Thank you!

The rear wheel bearings are supplied as a unit with hub. Fronts are replaced in the usual way. Non ABS type still exist.

The sensor side of the bearing (back when viewed from wheel bolts side) has a brown rubber disc stuck to the bearing seal. This carries the magnetic stripes that are sensed by the ABS pickup. You might be able to see them with a torch and small mirror.

ABS data stream isn't on the normally OBDII pin


normally an adaptor cable is required to read and clear the codes


most generic car scan tools will not work.

I’ve had the car 3 years, i replaced the gearbox from a Punto car 3 months ago
All sensors have been replaced with new
Rear near side hub was replaced as the brown contact ring was perishing.
All other magnetic contacts are in very good condition as I checked all these whilst everything was stripped down to remove the old sensors
When car is started, the abs lamp goes out for around 5 seconds presumably to do its checks and comes back on permanently.
I tried the ac multimeter test whilst spinning the wheel but no current was displayed on all wheels.
The ohms readings are still the same as above.
I’ve cleaned up all negative cables I can find, took apart the ecu and found nothing noticeable, the abs unit cable and contacts are all fine as is the brake fluid cable.

Tizzywizzy1uk said:

Rear near side hub was replaced as the brown contact ring was perishing.

Click to expand...

Has the ABS problem begun immediately following this bearing replacement?
Early vehicles did not have ABS as they were introduced shortly before it became mandatory. If you've got a non-ABS bearing, you'll never get a signal.

I replaced the whole bearing hub with a new one as the old one had a perished ring on it with bits out of it. I couldn’t get the ring separately as the bearing was fine.
I changed the bearing last week and I’m sure the abs light has been on for a few months before I decided to do anything about it.

Tizzywizzy1uk said:

I replaced the whole bearing hub with a new one as the old one had a perished ring on it with bits out of it. I couldn’t get the ring separately as the bearing was fine.
I changed the bearing last week and I’m sure the abs light has been on for a few months before I decided to do anything about it.

Click to expand...

The answer could be in the above statement.

Here's a theory.
The perished ring gave unusual signals, so the ABS light illuninated.
You replaced the bearing with a non-ABS one, so the light stays illuminated.

Next step is to recheck the part you bought. Check part number/spec to see if it was ABS or not.

Just checked the hub and it is abs. Checked the hub listing / no. and it is the correct hub for my vehicle with abs.
Got the Multiecuscan and cables with modified elm327 and serial port does not exist, so we’ve spent all morning trying to sort out Multiecuscan with no luck.. been trawling the internet and still have no luck.. I seem to be stuck now until I can sort out the Multiecuscan.

have you installed the elm driver? This must be done First.


then in program bottom left of click on settings

on the interface tab

scan for interfaces

will only find an interface if its connected to the car.

Yeah, done all this and more.. still stuck. I’ll look it all over again tomorrow