Cant help with the replacement. Have yet to even crawl under mine.

There was a repalcement campaign. Ref #2009020001 dated 03/2009.

Replace O2 sensor upstream of cat and update ECU software. 07-09 models/7,403 vehicles affected.

PM me your email and I'll send it to you if you can't find it online.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)