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What’s This??

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Old Oct 13, 2023 | 09:42 PM
  #1  
ReignRock's Avatar
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Default What’s This??


What is this part and what purpose does it serve? Just got my ‘04 D2 back from some work done (head gaskets, tranny leak, O2 sensor and ABS sensor). Drove it off and on for a week and my check engine light came on. Found this hose had come off. Previously had a P0441 code pop up. Since putting the hose back on the code hasn’t come up again. Obviously this was the issue. But what is this part and what does it do?
 
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Old Oct 13, 2023 | 11:58 PM
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Secondary air injection valve. Pumps extra air into exhaust at startup to heat up the cats faster.
 
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Old Oct 14, 2023 | 07:22 AM
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Originally Posted by miron
Secondary air injection valve. Pumps extra air into exhaust at startup to heat up the cats faster.
... and reduce hydrocarbon emissions in the first few minutes after cold start.
 
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