On the first fast idle the lamda reading fails ....but it’s failing only slightly and toward the lean side
On the second fast idle the lamda reading is a pass
Don’t confuse the lamda gas reading with the lamda sensors .....it’s often done
The lamda gas reading would be better off called mixture strength, lamda 1 or stoicimeteric 14.7 to 1 the ideal mixture strength .
If a car passes on the lamda reading this means the mixture strength is correct so any co and hc failings are because the cats are not doing there conversion .
Looks like the vcds readiness tests are bob on .
I have heard of this thinners thing in the fuel and if it works so be it , it’s worth a go , don’t buy cheap after market cats , they are rubbish with nowhere near the precious metals and rhodium of genuines .
If you are friendly with your Mot station often a good scragging up the road get the cats really hot then get it straight on the gas tester often gets the Co and hc down
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