Check injection at idle and warm engine

Hello dear Renaultgemeinde, I have a Renault Megane II Bj 2006 1.9 dci FAP and a small problem. I have the error message “Injection check” in the display, now some of you will think, just use the search function of this topic has been treated here sufficiently. I have read through really a lot of posts on the topic and did not fit my case. The error message “Injection check” + yellow wrench come when: – the engine is warm (from water ance) ie just before the third vertical line) – the engine is about 3 sec in idle mode, e.g. when I drove for about 10 min (motor warm), hold at a red traffic light and insert the neutral gear or press the clutch (empty run) The error message disappears when I raise the motor turntable to approx. 900 1 / / min; ie drive. If the traffic light stays longer red (approx. 10 sec.) and then drive up, the error message + muzzle key remains in the display and I have a power loss (emergency run) at d the next red traffic light (or if I press the clutch 3 sec during the ride) disappears the error message again and I also have full engine power again (no emergency run). My workshop read out the error memory: – I mean it was the error P004, with a very funny description with which the service technician could not do anything on site – and a glow candle was def. I then renewed all four glow candles; even if the candles did not have anything with the error message has to do. (An error message after starting the engine, which pointed to a def. glow candle I did not receive funny way…) The workshop then decided for a software update of the engine control unit and changed the sensor on the intake tube test method. Unfortunately this did not lead to the desired success. Does a solution here? Thank you and greeting Andreas