Hello and good evening, with my 850er 2,5 20V Bj 11/1995 the indicator light engine control light has been shining for some time. Was therefore also in the next Volvo workshop. Since the deletion of the error memory (€ 60,0) and the diagnosis “air quantity meter defective” (cost estimate € 400.0) was very expensive, I bought a retrofit air quantity meter at ebay. Lt. package leaflet and practical experience (the vehicle jerked with the new part like a buffalo) the error memory must be deleted when installing a new LMM, so that the engine control immediately adjusts to the new LMM. Therefore my question to the community: How can I delete the error memory and thus the control light engine control itself? I researched this in the forum, but the instructions are partly inaccurate or contradictory, therefore I wanted to open a separate topic. I look forward to your information.