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Posted by Chris Taylor on April 3, 2005, 8:10 pm, in reply to "Volvo 850 P Reg 2.5 B5254S Motronic 4.4.1"
The pump only works for the first few mins. It warms the cat up by adding extra oxygen to the rich fuel mixture when engine is cold. They are fitted to Ford Galaxy and some Vectra's and Tigra's. No need to check pressure. The only times they have generated codes for me is when they were knackerd. Volvo and Galaxy end op full of water.
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