#3 · Sep 17, 2019 I had this problem on my C4 Cactus. I had a roadside call out which put the car through a diagnostic check and there were no engine faults found. Under warranty, the car went back to the dealer. It was a faulty sensor unit. I was reassured and told it was ok to drive. New sensor unit was ordered and fitted=no further problems. Citroen C3 ECU failure - Screwloose : Alan With symptoms like that, I hope they've already changed the coolant temp sensor and the cam/crank sensors. White smoke/rattles might suggest an injector fault too. Like Lee; I've not had any problems with HDi ECUs - every other part, but not the ECU. Getting fault codes on my Citroen C4. P242F P1490 p3007. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to most newer diesel vehicles (Ford, Mercedes Benz, Vauxhall, Mazda, Jeep, etc.). Although generic, the specific repair steps may vary depending on make/model. 21 hours ago · Other potential causes of engine stalling in the C4 Cactus include a faulty crankshaft position sensor, a dirty or clogged air filter, or a malfunctioning electronic control module. In some cases, the issue may also be related to a problem with the car's electrical system, such as a weak battery or a faulty alternator. P1336 Crank/Cam sensor range/performance. ME7.4.5. Combustion misfiring on unspecified cylinders. P1338 ME7.4.5. Cylinder No.2 misfires. P1340 Camshaft position sensor B circuit Malfunction. P1341 Camshaft position sensor B range/performance. P1345 SGC (cam position) sensor circuit Malfunction / Crankshaft. P1346 Fuel level sensor B circuit UNNa.