My local dealer replaced the fuel pump of my 9000CSE from 1994. Eversince when i turn on ignition the word "Err" appears for about 3 seconds in the onboard computer display. What can be the source of this notice? The manual sais to step through the display options; the faulty device will be marked. But nothing is different; only the 3 seconds display..... Anyone who knows what's going on?