B'jour, Does anyone know a cheaper way? Peugeot specialist says he'll have to remove head to clear the carbon out of channel that delivers the air from secondary pump to exhaust. I've cleared the fault/engine light 3 times and it comes back. Pump is working....lots of air. Is there a way to clear the channel with compressed air or shove a wire through? Not financially feasible for mechanic to remove head. Any ideas? Could it be the 2 way valve? How can I check that? Cheers. Michael