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cayenne air suspension fault rear not lowing


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hey guys , past couple months my cayenne s 04 air suspension warning light has been on, after a minute of driving. when i try lowing or raising the vehicle, the front end works fine but the rear suspension stay stationery in raise mode. even when using the diagnostic to force the rear to lower nothing happens .fault codes in the level control system was for rear suspension holding valve . so i went ahead and replaced both rear holding valve and recalibrate the suspension. it worked fine for two months .now the warning light is back the rear suspension is stuck in high and not lowing.

new fault codes p1780 , 1400 

im unsure what to do. do i replace the valve again or is there some else wrong 

 

what do you guys think?

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