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[trackcars]

Anyone have any spare rear parking sensors lieing around with controller box as mine keep flat lining  thaks 

[05omegav6]

Assuming no towbar, ignition on/engine off, into reverse then go round the back and lightly rest a finger on each sensor in turn... The one that doesn't 'buzz' needs investigation 

Probably a loose plug or chafing wire, but as well to dismantle the sensor components from the bumper and clean them carefully/thoroughly as it could be as simple as a build up of crud around the frame... Includes polish residue as much as much

[Entwood]

There is also an inbuilt "self-test" system you may wish to use .. it involves finding the little 350 Ohm resistor that looks just like a blade fuse, (called a coding plug), its in the wiring harness just by the rear left light cluster. Remove that then switch on the ignition and select reverse



HTH 

[trackcars]

Ahh right mine flat line all the time in reverse. They did work fine then intermittently then flat line all the time in reverse now. I think it did have a row bar at one point as the bumper has been cut.I found that fuse but thought it was just for the old two bar. I will get this when I get home thaks for the help

[05omegav6]

At risk of inflaming an old argument,  you can count the beeps, or feel the sensors...

Only obvious flaw in the beep tests is if the loom was muddled up at some point... the mid sensors could easily be swapped, especially if the bumper's been off before...