Having just had my car serviced these things need to be replaced . Is the clutch pedal switch really important and what does it do, my clutch seems to be ok. The oxygen sensor, I know that this measures the gases present from the engine and exhaust( thats what the dealers told me ) will replacing this making much of a change as again my car feels to be running ok. The dealers said it will cause engine damage if not replaced and clutch problems if the clutch switch is not replaced. Here is the quote for the Oxygen sensor #021906262c $309 Labour $215 (AUD) clutch pedal switch not available but I checked on EBAY and they dont look to expensive about 10 english pounds,also air flow flag metre?Air flow flag metre #102907511a $281 Labour $71.50 . As my car is pretty old can you get these parts through breakers quite easily and is it worth it .