Question about 2005 Volkswagen Passat

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Reduced power on hills or inclines

Could this be a fuel filter or o2 sensor problem? The coil packs and plugs are new.

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It could be either, but I'd lean toward the fuel filter for three reasons - first off, that symptom is usually indicative of a clogged fuel filter (you drive fine when the road is level and your engine doesn't need too much power, but when you go uphill, or punch it to pass, it bogs because the filter is clogged and restricts the flow of fuel to the engine). Also, I'd do the filter because it's both easier and cheaper, and even if it doesn't fix the problem fully, the fuel filter is a wear item that needs replacement periodically and you're therefore not wasting money by buying one and installing it. Finally, a bad O2 sensor will usually throw a fault code and a check engine light. It has to be fully "bad" to do so, and could be getting there but not bad enough yet to throw a code, but the fuel filter is a more likely candidate. Change that out and see if the problem goes away.

Posted on Jul 25, 2008


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