Hello people, have a Frontera B 3,2 automatic Bj 2002 for 1 year. Now the TÜV stood up. AU did not pass Co2 values too high. Lambda probes report no error in the error memory. Also look quite new, the previous owner has done something. Have a possible error source, the connection flame tube to Krummer left pfenstert when engine cold, when warm, goes back, so the stake is leaking. Can this falsify the values? But there is anyway imme r some congestion pressure, then the leak can’t pull in any outside air? Or am I wrong? I still have to check “AGR” for further reason. If this is hanging or totally messed up …. I found further solution in the net: Exhaust soil so that the Lambda heating works better !? Is there something about it? Further procedure: Become flame tubes (Are there 2 pcs. because V6) times expand and endoscope, so look in with camera probe. don’t know how old they are. As I bought it last year, I only felt timing belts, wapu, air filters new and automatic transmissions. Additional possibility (read in net) to remove probes and clean with gasoline. And then, at AU re-examination make the flap trick (puff to stuff). Does anyone still know possibilities or causes ?