Hi All. Engine light came on on my 07 SC. Got the IID tool on it and it says left bank too lean. Cleared the fault but it keeps recurring. Obviously cos the fault isn't rectified. Car is well and regularly serviced and does motorway miles all week so the engine is clean, and spot on.
Any ideas? Tony
You're always in the ........it's just the depth that varies
2011 5.0 Autobiography Fuji White
2019 Audi Q2 in White
04 SL55AMG

Gone:
07 4.2 SC in silver.
06 4.2 SC in black RSE
RRS 4.2 SC in Black RSE
52 4.4 Vogue in silver
04 Mercedes CLK 320 Conv
03 4.0 V8 ES Disco in Silver
00 TD5 90 County
98 4.6 HSE in Epsom x3
97 3.9ES Disco
93 L 4.2 LSE in black
too many classics to mention !
V8 Lightweight
Too many series to mention !
IID for L322

Can be all sorts tbh.. vacuum leaks, Pcv system,bad maf sensor ect. Start with the obvious like the Pcv hoses. General inspection on them and maybe a smoke test to find any leaks

All hoses seem good. My son is a mechanic and he's checked, but I just thought there might be something obvious! Don't think it's the MAF as it is only registering the fault on one side and the MAF is a single intake into the SC. Thinking perhaps Lambda sensor???? Tony
You're always in the ........it's just the depth that varies
2011 5.0 Autobiography Fuji White
2019 Audi Q2 in White
04 SL55AMG

Gone:
07 4.2 SC in silver.
06 4.2 SC in black RSE
RRS 4.2 SC in Black RSE
52 4.4 Vogue in silver
04 Mercedes CLK 320 Conv
03 4.0 V8 ES Disco in Silver
00 TD5 90 County
98 4.6 HSE in Epsom x3
97 3.9ES Disco
93 L 4.2 LSE in black
too many classics to mention !
V8 Lightweight
Too many series to mention !
IID for L322

Could be a sensor but knowing a rangey it could be a multitude of things..if you have done a smoke test and tested the fuel trims /fuel pressure/ fuel filters good and alls well then a sensor would be next on my list..

thought IId was as good as dealer level so would pinpoint the fault ??

did you ever sort this? sounds similar to mine Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

Yes. All sorted. Lambda sensor. 5 minute job to sort. (well for my lad that is)  Tony
You're always in the ........it's just the depth that varies
2011 5.0 Autobiography Fuji White
2019 Audi Q2 in White
04 SL55AMG

Gone:
07 4.2 SC in silver.
06 4.2 SC in black RSE
RRS 4.2 SC in Black RSE
52 4.4 Vogue in silver
04 Mercedes CLK 320 Conv
03 4.0 V8 ES Disco in Silver
00 TD5 90 County
98 4.6 HSE in Epsom x3
97 3.9ES Disco
93 L 4.2 LSE in black
too many classics to mention !
V8 Lightweight
Too many series to mention !
IID for L322

maye not the same as me ten as my voltages look about right cheers Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

I didn't check voltages to be honest, but I had a new battery fitted in March. Tony
You're always in the ........it's just the depth that varies
2011 5.0 Autobiography Fuji White
2019 Audi Q2 in White
04 SL55AMG

Gone:
07 4.2 SC in silver.
06 4.2 SC in black RSE
RRS 4.2 SC in Black RSE
52 4.4 Vogue in silver
04 Mercedes CLK 320 Conv
03 4.0 V8 ES Disco in Silver
00 TD5 90 County
98 4.6 HSE in Epsom x3
97 3.9ES Disco
93 L 4.2 LSE in black
too many classics to mention !
V8 Lightweight
Too many series to mention !
IID for L322