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how can i 406 auto box ?

my 20 hdi auto box . when cold and pulling away it changes up to 2nd then back to 1st then back to 2nd 3rd and 4th and when i take my foot of the gas to slow down the car shudders. when the car has gone a short distance its ok. no fault codes shown.53 reg.
dave c, January 2010
You may have a problem with the range switch. It may be telling the computer that you have selected first/second and as this is seen as an OK request, no fault codes will be set. To verify look at live data with a scanner that can see this information. Check TPS and speed sensor readings as well.

mags, January 2010
link Click here to see other fixes for Peugeot 406 HDi.