They may be paragons of sophisticated German engineering but funny how once they reach a certain age, they will only yield their secrets or cooperation to Liquid Wrench, a blowtorch and (WHANG!) a 2-lb. (WHANG!) sledge. (WHANG! WHANG! WHANG!) Score: Me 6, oxygen sensors 0 (lifetime). The road test will include a stop at the neighborhood ice-cream stand. I believe I've earned it.