Hi All

Last week after being parked up for a couple of hours after a 2hr drive, the EML came on when I started up, with a bit of a rough idle. Dug out the IID Tool and the following faults came up:

0x41D Lambda control adaption fault bank 2
0x41C Lambda control adaption fault bank 1

I cleared them and drove 120 miles home, but 5 miles from home the EML and faults returned. Cleared them again and nothing has happened until this morning, when the EML light came on with no faults registering on the IID Tool after starting from cold.

Drove 5 miles or so and after a 15min stop, the car started but wouldn't idle, just stalled. Started again and kept the revs up and all seemed fine on the way back, and it now idle without a problem when stopped. There is now a hint of movement on the rev counter at idle if I look hard enough!

Had a good search of the forum and narrowed it down to either the MAF sensor or PVC system. The PCV hoses do seem a bit gummy so will replace those in due course, however the stalling on start up suggests a problem with the MAF sensor.

Just going to have a look at the MAF sensor and see if it needs a clean.

Any thoughts on which one is more likely? David

2012 Range Rover Westminster 4.4TDV8
2004 Range Rover Vogue 4.4 V8 (LPG) (Not quite gone)
2021 Mazda CX-5
2003 Porsche Boxster

Last edited by crowebeard on 14th Feb 2019 9:26pm. Edited 1 time in total

maf is simple-check live values match what are asked for....pcv would be first port of call as its a job that needs doing anyway

Thanks Tony66 - MAF readings appear to be around normal (although perhaps little low at idle) so will concentrate on PCV hose replacement. David

2012 Range Rover Westminster 4.4TDV8
2004 Range Rover Vogue 4.4 V8 (LPG) (Not quite gone)
2021 Mazda CX-5
2003 Porsche Boxster

remember issues such as egr control etc effect maf readings too

i stupidly had to replace my maf after having to demolish the original[seized bottom screw] on my 530d only to find it was the egr switching controller,kicked myself as i was misled by what i saw on the diagnostics-it would have been a non issue but the knacked screw meant i had to buy a new bosch maf-my intention was to clean it initially,i suppose it would have needed done anyway though,the way i should have went about it was blank off egr vac hose and check data...but you live and learn

symptoms on the m57m 530d were a strange pulsing at idle,slight loss of power on initial pull away...

As the weather was so good today, I finally got around to fitting the new top breather hose on the PCV unit that @duckworthparts kindly sent last week, but while I was digging around the back of the engine I found a couple of additional problems that may be causing the occasional lumpy running.

Firstly the vacuum pipe from the air intake had become disconnected: