Hi, I've replaced my 501 sidelight bulbs with these:

U501WHP2+(501) 12-16v Ultra High Pwr Wide 1W Whi(Ultra Ver) Pair

I've had them in my VRS for about a month and recently the passengers led had started to flash on and off all of a sudden.

Anyone else had this problem and does anyone have any ideas as to what causes this?

Sy

Em, the review in the link seems to be talking about them being for dashboard lights, not sidelights?

Not sure if this helps as Im guessing you have a Mk1 Octy vRS, but in http://www.briskoda.net/forums/new-octavia/new-octavia-tips-tricks/55750/?highlight=octavia+tips the following info is given....

LED bulbs don't work in the tail lights of the octy as the stop and tail lamps are duty cycled. In the event that a tail lamp fails' date=' the car simply reduces the voltage supplied to a brake light element so it acts like a tail lamp. It also warns you with a lamp failure indicator on the dash.

Reversing lights, front side lights and indicators are not duty cycled but if you want to use leds for these then you need shunt resistors across the lamps to emulate the load of a standard bulb otherwise the lamp failure warning comes on and the supply to the lamp in question is turned off until you present the correct load and turn the ignition off and on again. Some led lamps come with the shunt resistor built-in.[/quote']

Could it be a similar sort of problem?

no its nothing to do with a light appearing on the dash, the sidelight just flicks on and off. its a fabia vrs by the way

welcome to briskoda.

Welcome to Briskoda