So im getting the error 03156 which the internet doesnt bring much up for, found one that states is this sensor which i believe is part number 1Z0877829B

 

Does this need to be coded to car as odd add on ebay says might need coding, or is it a straight swap?

Need more info.

Hi MicMac, what other info would you need?

Ok ebay said the other part number i think thats for the plastic cover its 1z0951171

its the ultrasonic alarm sensor

 

one of these https://www.ebay.co.uk/itm/293811201582?hash=item446883262e:g:NGoAAOSwB4Zfn~hK&amdata=enc%3AAQAHAAAAoKrT%2BAek%2FnIlF%2BPGAlAUQDosTq5r%2Fpc9bTP9bq8p3wFj72aZrwLecv8P5Ui8wqnh4PqoWVoxsq1nA4rhH3%2BitRCCx09ptZElHA91HdJGvXcrzkEYJQ%2FxC%2BnlODuxJrbbJlWdBh%2FJdiDCqagP4FVbHdFL6BzbGeV2PMomDW%2Fas1b5VtNe6W6Vr9Iejco9wkXl%2FYxwrFkHKDDv5tqH8%2BZhyu4%3D|tkp%3ABk9SR8j9ycCjYQ

What is your problem, what are you using to detect the error code and why do you think it pertains to the ultrasound unit?

the scanner came up with shows the below

 

Access the unit and (un)plug the connector a few times.

cheers just cleaned all connectors and alarm seemed to arm ok first time, is it really likely to be something that simple and not the boards gone faulty?

Yes, the connector pins oxidise over time and with vibration leads to a bad connection and a fault occurring.

 

Nothing unexpected on 13 year old car electrics.

well been fine all weekend, then none stop today 🤨