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2016 C4 TPMS Warning Light Reset? |
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DonXabi |
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Member No: #60283
Joined: Nov 30 2022Location: UK |
Had the TMPS warning light flash up yesterday to say the LHF tyre had low pressure.........it wasn't. This morning it flashed up again to say the LH AND the RHF tyres were both low on pressure. I have checked the pressure on all four wheels, all are as per spec......so how do I re-set the warning light? Looking around here, seems to be various ideas, the main one being that they SHOULD re-set automatically when the pressures are correct?? If so, and they don't re-set.........is it a dealer issue to re-set them? |
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vexorg |
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Member No: #48843
Joined: Jul 06 2017Location: Scotland |
What type of system is it? Measures the pressure, or measures the wheel speed? |
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DonXabi |
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Member No: #60283
Joined: Nov 30 2022Location: UK |
I would assume pressure as it states that, in the first instance, the LHF, was low tyre pressure. How do you tell the difference to what it measures? Historically I've only known TPMS to measure the tyre pressure. |
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routemaster1 |
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Member No: #574
Joined: Jul 08 2007Location: Dorset |
The standard indirect TPMS does not indicate which tyre is low. There is no reason why it shouldn't, as my new non-Citroen car has indirect TPMS and it does indicate which tyre is low. It would only require some simple software mods. It is easy to reset the indirect system via the menus, but I don't know about direct. It should tell you in a manual, if you don't have one you may be able to find something on-line. | ||||
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DonXabi |
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Member No: #60283
Joined: Nov 30 2022Location: UK |
Thanks - there is no mention in the manual about re-setting it and nothing in the menus therefore I assume it would re-set when the tyre pressures are correct, but it still comes on suggesting that the issue is elsewhere - or potentially both valves are faulty - it has only happened since the temperature dropped over night, but that might just be coincidental. If anything, both fronts are now slightly over inflated - so I'll get them spot on as per the manual and see if that cures it. |
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vexorg |
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Member No: #48843
Joined: Jul 06 2017Location: Scotland |
That's why how it measures matters. If it is direct, then the wheel has a pressure sensor in it, these are battery powered and need replaced after several years. The sensor then transmits this to a receiver on the car near the wheel. The indirect method looks at the individual wheel speeds form the ABS and based on the steering can work out what the correct wheel speed should be, so if that's not working right then it would be more difficult to pinpoint. Usually the ABS would throw up faults first. |
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DonXabi |
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Member No: #60283
Joined: Nov 30 2022Location: UK |
That could make sense - maybe the cold weather has finally killed the batteries off........... | ||||
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DeuxChevaux |
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Member No: #16472
Joined: Nov 21 2010Location: North Norfolk UK |
With the direct system if it throws a warning it says somewhere (handbook?) that a reset is achieved by driving the car at over 50 mph for 15 mins. I have never had a low pressure warning but have a spare wheel and tyre and if this is put on or new tyres are fitted and the wheel goes back with its new tyre to a different location I get a warning that will not go away until I have driven about 3 miles away from where I live at about 50 mph. Mine is a 2015 car, my wifes is a 2016. With hers we have never had any warnings with new tyres or wheels swapped at all. Don't know what system is on her car though. | ||||
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