'14 A4 suddenly TPMS, ABS, Traction, parking brake, headlight level alarms coming on

[82DMC12]

I have a '14 A4 and all those warning lights have started coming on immediately after starting the car, all in a row. At first just the low tire light came on maybe 2 days prior, but the tires were all within 2 PSI of each other. I set them perfectly and saved the new pressures. Then two days later all this. A bit of digging seems to think it could be a TPMS sensor is not working so basically the car can't use it as input for all those other tire and speed related functions. Anyone else seen this? Fortunately still under CPO but curious what the dealer will find.
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[ELaw]

Not sure about the headlight level and parking brake warnings, but an ABS problem (most likely a bad sensor) could cause all the other things you're seeing.

When there's a fault in the ABS system it "cascades" to other systems that rely on the ABS data: traction control, stability control, and TPMS.

These cars don't use sensors in the wheels like many other cars that have TPMS. Instead, the computer looks at the speed of all 4 wheels via the ABS sensors. If it sees one is consistently higher than the others, it assumes that's because of a low tire. Higher speed on one wheel means its rolling diameter is less, which would be the case if air pressure is low.

[82DMC12]

Thanks for the response. I won't be able to get the car in until March since I'm out of the country for work last half of Feb. I guess a bad battery can do strange stuff like this too. I'll check the connections on the ABS module and make sure nothing came loose there.

[82DMC12]

Hi guys, finally an update. The problem was a bad front pass side wheel speed sensor. Fixed under CPO and all good now. Hope this helps someone else!

[BrianVan]

Wonder if Vagcom or carista, torque would of pulled codes to see if the sensor was bad? Did they give you any codes or see any codes pulled on the invoice?

[flowhigh]

Wonder if Vagcom or carista, torque would of pulled codes to see if the sensor was bad? Did they give you any codes or see any codes pulled on the invoice?

No question vcds would've