yellow transmission warning light and clunk

[rudey]

this light came up intermittently before and would clunk when gear engaged and now its on fairly permanently
ps my zed is 2003 30i auto 5 speed
do i look to change gearoil ?

 

[Johnbmwz4]

My Light came on intermittently and when I drove it with the light on the car was in some sort of limp mode and sounded generally rough but no clunks that I can remember. When no light car was fine. I eventually got it fixed and the problem was the auto transmission switch which apparently can let moisture in and eventually fails. Cost about £300 fitted and never saw the light come on again after that.

 

[rudey]

you dont have the part number ?

 

[AlienZed]

As John said ,
More than likely that switch ,just replaced one on my latest 3.0ltr Auto £243 + fitting so about £300.
It put the car into limp or 4th gear i drove back from nottingham in that mode ,bit dodgy taking off from roundabouts.
Pic of part its on the passenger side of the gearbox 3 bolts and plug in

 

[rudey]

Cheers m8ty, took for a spin earlier yellow warning gone, put some fuel in warmed it up took to my mates garage used snap on diagnostics and cleared all codes but none from gearbox, cleared the lambda sensor ones and perfect now
So weird

 

[AlienZed]

Tbh ,they can be intermittant ,
I found that turning it off and then on again it came out of limp mode and drove perfectly .also give it a squirt of wd40 and check the connections on the plug in connector
Just see how you go before spending ya money.
M

 

[rudey]

Sprayed with little duck oil but will keep an eye on it, cheers

 

[Johnbmwz4]

Yeah was really weird , had the car for 3 years and more or less started a month when I had car but when I turned engine off and back on again all ok. I only saw the light once every couple of months so never really bothered me. I got it replaced just for the peace of mind for the next owner. Phoned round a few gearbox repair garages to see if it was going to be a cheap fix and all but one were unsure and wanted to charge me a diagnostics fee before committing to any price. The one I used was based in Huddersfield and was 100% sure it was this but would do a diagnostics for free before fitting the new auto transmission switch. This was the one who knew what the problem was over the phone.Took around 45mins while I sat in waiting room. Extremely happy with the service I got .