Hi to all. Am contemplating the purchase of a 240K, 06/'06 build 407 sedan with RHR and 6 speed Auto. Presently it starts well then plays up badly with strong jerking as it struggles to warm up and attain 3,000 revs as it produces a considerable amount of smoke. Once warm the smoke blowing ceases while the power remains minimal, in that 3,000 is the max even when held in 3rd. My common variety Oxgord MS300 OBD2 Code Reader shows a P0299 (Turbo underboost) and 3 pending faults being P0299 & P0471 (Exhaust pressure sensor CKT range/performance & P0095 (IAT Sensor 2 circuit). Considerable soot is visible on the rear boot panel.
After the test drive and seeing the Turbo underboost code the immediate problem analysis was the not unusual split/leaking turbo to manifold air piping. However, the owner recalls the 1st sign as being a sudden power loss on a 110kph highway. After a reasonable stop he had to proceed and the car did so as normal. Then about 6 weeks later the loss returned and has remained. The car was bought new by in-laws and Dealer serviced in Newcastle till coming to Coffs 18 months or so ago. The vacuum tubing to the white 'Y' piece looks good. The injection system is Siemens according to Service Box.
In recognition of the intermittent style of the fault a leaking moulded turbo air pipe seems unlikely and an electrical or vacuum fault far more likely. Thanks for any thoughts or experience.
After the test drive and seeing the Turbo underboost code the immediate problem analysis was the not unusual split/leaking turbo to manifold air piping. However, the owner recalls the 1st sign as being a sudden power loss on a 110kph highway. After a reasonable stop he had to proceed and the car did so as normal. Then about 6 weeks later the loss returned and has remained. The car was bought new by in-laws and Dealer serviced in Newcastle till coming to Coffs 18 months or so ago. The vacuum tubing to the white 'Y' piece looks good. The injection system is Siemens according to Service Box.
In recognition of the intermittent style of the fault a leaking moulded turbo air pipe seems unlikely and an electrical or vacuum fault far more likely. Thanks for any thoughts or experience.