Hello dear community Unfortunately I have already been about 4-5 years a recurring problem to my Megane : Megane Grandtour 1.5DCI ,76Kw (103 PS ) , K9K , Bj 2008/2009 Error description : In summer I have (only) the problem of the error injection test (is displayed in the instrument ) , which only sporadic and temporally totally different occurs and even temporarily delete itself again . Error code in this is / are P0544 exhaust gas temperature sensor circuit Re ihe 1 Sensor 1 In winter, i.e. at lower temperatures, I still have power plus the error P0089 fuel pressure regulator with the problem that when I come to the approx. 2500rpm, the engine starts to jerk and immediately goes with the message “motor stop ” into the emergency run. Driving itself is then further no problem, only that no gas is accepted and ü90 km/h is not possible. until now I have made replacement: pressure regulator on injection pump yourt ( leakage ) image, return line ( leakage ), incandescent pins ( 1 was defective ), throttle valves control ( defective ) Now to the question : 1. to P0544 Where is this sensor and is it only 1ner or are it several ? According to 3 different friendly ones I got 3 different statements, which were between 1 and 4 sensors 2. to P0089 Which pressure regulator could be meant there and is this exchangeable ?