Righty hoe .....some good info there for us to work on
Fans on .....code for high pressure switch short to ground ,I reckon this is the driver for them fans on ...look at the A/c pressure ...more than 51 bar !!! Massively over pressure for a/c high side ....no wonder it's running the fans but that pressure is a consequence of a faulty pressure sensor ...high pressure sensors normally on the air con condenser somewhere or on pipe work from compressor high side to condenser so you need to do some investigation into that .
Lamdas codes and diag
The after cat lamdas are spot on but the cats are very good at masking the real story ....remember lamdas measure oxygen .....not rich or lean conditions ,even though they can show rich or lean conditions ......for instance ....
Let's say you have an engine that's running at its correct mixture 14.7 to 1 but you have a leaking exhaust manifold or a cracked manifold or SECONDARY AIR INJECTION bleeding air in ,all of these being before Pre cat lamdas so the mixture as read by the lamdas is lean but the engine is running at the correct air to fuel mix as we know ..... we are getting ' false air ' so the ecm will respond by adding fuel to get the mixture correct but it can only increase injection duration so much before it goes out of its 'working window ' , when this happens then ecm will set ' system to lean codes '
I'm not saying it is the air injection system but we 100 % need to rule it out , they normally have reed valves to stop blow back so blowing down the pipe may not be enough to open them , can you bung the pipe up some how do we know no air can get into the manifold and affect the lamdas .
If you do this and we are still getting lean mixture codes my next tests would be to smoke test the manifold ....check that oil filler cap is not getting sucked down to hard ....eg . breather system not leaking to atmosphere or pcv pods not letting loads of vac into engine , fuel pressure tests and so on .
Are the new lamdas correct for chassis number are they the same part number or equivalent to what came out ?
Some things to have a go at
Lee
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