Just put in my Fabia Saloon to the dealership for its annual service. I've been advised that the high pressure sensor on the aircon needs replacing.

Is there a HP sensor on the aircon ? I thought it was LP

Further, another party at the dealership reported a problem with the ABS. I would think that there would be an HP sensor there.

Obviously, I don't want to drive off with a car with partially or non-functioning ABS.

Please can anybody advise ASAP - due to pick-up car in 1 hour.

Nick

I'm pretty sure there's an HP sensor on the aircon (near the coolant expansion tank?), fitted to offload the compressor if HP rises too high, and pretty sure there isn't an HP sensor on the abs - why would there be?

I'm pretty sure there's an HP sensor on the aircon (near the coolant expansion tank?), fitted to offload the compressor if HP rises too high, and pretty sure there isn't an HP sensor on the abs - why would there be?

Cheers for the response.

I thought some ABS systems had a high pressure reservoir.

Nick

If there's a live fault with the ABS, the light should stay on. The ABS will store faults until they are erased, so it will show up any historical faults such as low battery voltage as an intermittent or sporadic fault.

The ABS and air conditioning are in separate controllers, so there is no mistaking which fault is where. If the fault with the air conditioning high pressure sensor is a low signal fault, in my experience it shows this fault if the system is low on gas. It is possible that the sensor may not be faulty and the cause could be lack of refridgerant.

If there's a live fault with the ABS, the light should stay on. The ABS will store faults until they are erased, so it will show up any historical faults such as low battery voltage as an intermittent or sporadic fault.

The ABS and air conditioning are in separate controllers, so there is no mistaking which fault is where. If the fault with the air conditioning high pressure sensor is a low signal fault, in my experience it shows this fault if the system is low on gas. It is possible that the sensor may not be faulty and the cause could be lack of refridgerant.

I was told that the refrigerant was topped-up and that the sensor still showed a fault.

Now waiting-on delivery of a sensor., which is I am told £40 + labour. Does the system have to be drained to ft the sensor ?

Nick

Edited 10 February, 201016 yr by Clunkclick

I was told that the refrigerant was topped-up and that the sensor still showed a fault.

Now waiting-on delivery of a sensor., which is I am told £40 + labour. Does the system have to be drained to ft the sensor ? Nick

I'd reckon so as the sensing end of the sensor will need to be inside the system pipe work.