I was towing my car trailer a couple of weeks ago when a fault was registered. I checked with my Nanocom and from memory before I erased the fault, it stated something like, "front n/s height sensor out of range". I should have taken the precise wording!

I assume that was the height sensor and will probably need replacing, (All are original, 80K miles, 2001 car).

Yesterday, after about 20 miles, another fault came up. "PRESSURE SWITCH IS NOT CHANGING STAT ALWAYS OFF". I had my gizmo with me so pulled over and erased fault. For the remainder of the journey and return home, all was well.

Advice on those two please......The first makes sense and I assume that I should replace the height sensor some time, (all in agreement?) but the other one??

Not necessarily you should replace, try first to calibrate it, or use the Nano to see it is moves within the parameters.

I will have a go at doing that tomorrow.

What about the pressure switch message? It doesn’t really mean anything to me.

I had that one due to a weak pump. Pressure switch changes state at around 140 psi yet my pump couldn't manage more than about 120 so could never get the reservoir fully up to pressure.

I did overhaul the pump and fit new seals in 2019. That was only about 5K miles ago.

Richard, you say yours was running at 120 psi.

How did you measure this?

can be done by attaching a gauge to the air tank line

You will have to connect it to the blue pipe from the compressor. But it will not be causing a soft fault. If you take the blue pipe off the compressor and put your finger over the outlet and it blows your finger off no matter how much pressure you put on it, air pressure is good enough. If you can stop it compressor needs refurb. There are no fault codes for compressor operation. It either gives enough air to charge the system or it doesn't.

phazed wrote:

Richard, you say yours was running at 120 psi.

How did you measure this?

Old blue pipe with one end cut off, push on Schrader valve and tyre pump with gauge that goes up to 150 psi. But as said, if you can stop the air with your finger, it isn't generating enough pressure.

I may be thick, how do you use this and do you connect direct to pump?

Yes, but it does mean you need a spare blue plastic pipe that would normally go from the pump to the valve block to chop the valve block end connector off. Connect the gauge directly to the pump, power it on and see how high it can get the gauge to read. A good pump will get up to over 15 bar (over 200 psi).