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  1. E46 General
    Does anyone know why are there three different check valves in secondary air pump system? One way valve (black and white), relay injection valve (back of intake manifold) and the one by the pump itself. Another question is where does it inject air? Intake manifold? Or exhaust? Just curious...
  2. E46 General
    Hi everyone, I took my baby home from my dad's house, approx 20-40 mins away from my house I parked in my garage and switched the engine off and had a panic attack because i started hearing a loud hissing air leak (like a tire flattening) that i was unsure about, and it wouldn't stop, knowing...
  3. E46 General
    Just had the check engine light come on in my 02 325 XI and had it plugged in at autozone . 2 codes came up . 1.) P0492 secondary air injection system (bank 2) 2.) P0491 secondary air injection system (bank 1 ) The code reader recommended that the likely solution is the replace the smog pump...
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