i have an e60 with m54b30 engine and ive noticed that it is quite slower than other e60’s
my 0-100km/h is 10-11 seconds where as it should be 6-7 seconds. i have a cel and the dme codes show its an oxygen sensor. could it be that its causing the loss in power or should i look deeper into it? the car has 250k miles but i dont think it should go 4 seconds slower than stock power

 

Replace the O2 sensor.

 

I hope this doesn’t offend you… but if you want the engine to perform the same as when it was brand new, then that’s a good time to think about absolutely overhauling everything possible or completely a engine conversion! These are expensive and well-built cars, but I don’t understand why people so often modify old engines like adding a turbocharger to a junkyard small block Chevrolet… you’re not modifying the engine, so, realistically, you should be able to even do a simple bearings/gaskets/seals overhaul and get amazing results. But even the suspension can wear out significantly to impact your acceleration. If the parts aren’t as solid as originally, then there’s more bounce and less power transferred directly to the road, right? I’m not an expert I just don’t believe anyone can expect original form performance when a car has more than 200,000 miles.