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PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5
the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty
missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer
you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.
Check your spark plug leads,as this is often the cause of missfires,and check your spark plugs,you can use a multi meter and check for a varience in resistance to comfirm the problem
its only an idea but the engine management on the early beetles was a bit primative if your confident swap the injectors over from nos 1-4 and then see if the random missfire moves from cylinders 4 to 1 if it does then you have an injector fault if not let me know as i am a vw master -tech hope this helps
as far as jennablackies fault goes it could be as simple as damaged plug leads which would cause a missfire have you got any fault codes because its obviously nothing to do with cat/lamda probes
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