I recently been receiving the 'check injection' warning message which is annoying because the car also loses power when the messages pops. I figure that cylinder #1 was the culprit (intermittently cutting power). When I switch off and restart the car, the error would go away and the car would run just fine. I started experiencing this problem after I replaced the exhaust valves that were bent. This issue usually occurs when I'm driving around town on low gears (1,2 & 3). At times, the error would not go away even after restarting the car, so when that happens I disconnect the battery and reconnect it and that fixes the problem. I recently took it to a mechanic for a scan and it gives the following errors: - DF049 Refrigerant sensor circuit, voltage outside tolerance limits (active). - DF109 Low fuel misfiring, destructive misfiring. - DF038 Computer, Internal Electronic Fault - DF078 Motorised throttle control circuit, general motorised throttle control fault.