Hi
2006 plate started to idle rough when cold start but fine once warm, it’s come up with o2 sensor faults but when checking for air leaks noticed this pipe isn’t connected to anything? What’s it for? No obvious air leaks so maybe in o2 sensor?
Tried 3 bulbs, volts and wiring looks good, parking sensor works, reverse bulb doesn’t? Could it be reverse switch then but I didn’t think parking sensors would work if switch is faulty?