Its impossible to get to them from under the car as the gearbox and exhausts are in the way. If you have small arms and don't mind a few scratches then its just possible to get to the driver's side one from behind the engine. You need to remove the air intake duct between the air filter and throttle body boot, and unbolt the O2 sensor bracket from the bulkhead and its just possible to reach the end and give it a squeeze to see if any schmutz comes out. I haven't found a way to get to the other one though.
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