Accumulator pressure is excessively above command
Warning! The fuel system has a very high pressure, up to 2000 bar. The fuel system must be depressurised before any work is carried out. The system should always be treated as pressurised, even when the engine is switched off. Wear protective gloves and goggles. For more information about safety when working with the fuel system, refer to service information "XPI fuel system". Test the high pressure pump performance using available workshop tests. If the operating time after the fault code was generated has exceeded 10 hours, the EGR cooler must be emptied. Because there is a risk that condensation formed in the air-cooled EGR cooler when the EGR system was shut down. Carry out the emptying in according to the instructions, see Workshop manual, 01-65 EGR system, Air-cooled EGR cooler.
What you'll see
There may be abnormally loud combustion noise or engine knock. When this fault code is active, engine power is reduced and the EGR system is deactivated. The fault code cannot be cleared when it is active.
System reaction
MI warning lamp MI_B1 and yellow warning lamp
Diagnostic depth
Fuel pressure in the accumulator is higher than requested.
Possible causes: • Fuel metering valve regulating poorly or leaking. • Fault in the high pressure pump.