Hi. I've read a number of posts on yaw sensors and I am wondering if this is the same as the Lateral Acceleration Sensor?... I am getting a 1423 error code and the ESP light is staying on (amber triangle light in Tacho guage). I went to an Audi workshop recently and they diagnosed the error and then cleared the code. The problem went away for a week and has now come back??.. I was told that the code was a 'Hard Code' what ever that means??... I'm hoping it is a loose connection or something simple. I had the battery replaced just prior to taking it to the workshop as I knew it was in poor shape and thought it might be a low voltage problem. Codes were then cleared, warning light went out and is now back on again. Can anyone tell me where to look for the L.A.S. sensor so I can clean and check the connection before getting it replaced?.... My local euro workshop tells me that it is in the centre console, the Audi dealership tells me it is at the rear suspension and I've also heard that it could be under the dash... This is a 2000 model RHD car by the way.... I've also heard that the same issue can sometimes be related to the ABS sesnsors... I'd prefer to check connections first rather than risk random sensor replacement until the problem is eliminated? Confused.....

 

Ok I've removed the under dash cover (RHD vehicle) and to the right of the steering column is a relay board and to the left of the column, mounted high and in line with the clutch pedal are the two black box units you see in the photo below. They aren't exactly easy to pull out due to the top mounted nuts being sunk way down deep inside the bracket so before I go pretending I'm made of rubber can anyone confirm if these are the G200 & G251 sensors? Thanks.

 

Here is the latest on my 1423 Lateral Acceleration Sensor error code. I might be speaking up too soon but I think the symptom may have been cured without having to go to the expense of replacing the sensor. Firstly I replaced the battery because I knew it to be faulty and low on voltage. This would have been the cause of numerous system communication error codes. Then after much research I found the G200 sensor and disconnected the terminal and sprayed it with contact cleaner and refitted it. I also pulled all of the fuses from the RH side of dash mounted fuse box to check for any that might have blown. This would have also worked the contacts in case any had become compromised. From there I took the car for a couple of good long runs and I cycled the ESP switch several times and leaving it on for a while to work that side of the system as well. I noted at this stage that the ESP switch was working much more reliably. (The switch wasn't doing anything at times previously.). Since then all seems to be working ok. Hoping that it stays that way too. Before going to great expense this might be worth trying if you are experiencing the same problem. All of this can be easily done by anyone with the correct size torque spit tool, a little patience and moderate auto aptitude. Cheers & thanks to those who provided their feedback.

 

Bummer... Worked great for a few days and then last night the ESP dash light came back on again. Back to the drawing board. Next step will be to replace the G200 sensor.

 

Another trick I learned in my travels from an Alfa mechanic was to check the contact tension or pin drag on the sensor plug. To do this you will need to get a male contact pin from a similar style connection in the sensor. The three connection pins in the G200 sensor look to be a little smaller in diameter than a standard paperclip. (I couldn't get a paperclip to fit so don't try it or you might make the connection worse) Once you have the correct pin diameter push it in and feel the level of contact drag. If the drag on the pin is insufficient then the contact may be weak or intermittent which could be the cause of the failed sensor diagnostic. If the pin drag is inadequate then it may be able to be remedied by opening up the connection plug and then carefully depressing the pin securing or lock tabs using a lock picking tool so that you can gently pull the wire backwards out of the plug connection. Once you have the loose wire and metal female connector in your hand then press down gently on the pin drag adjustment tabs at the front of each of the three connectors (the colour coding of the three wires on mine was yellow with a purple trace, Yellow with a brown trace and yellow with a red trace) to increase the contact drag pressure. Then recheck the pin drag pressure using your test pins and if ok reassemble everything and recheck your handywork. Failing that, only then would I go down the path of replacing the sensor.

 

hello just like to say i have the same problem with my 2001 audi tt mk1 plus engine light on took the battery off took it to a garage they said it was the wrong
one not enough power .so hopefully i have the same problem.where is the sensor so i can clean it thanks john