Question about 1997 BMW 328
Check engine light on codes P1421 P1423 what is it and how do I fix it
I'm not sure where you got the codes... I have a Peake R5/FCX-3 - nice for diagnostics.
You should look at the various BMW forums out there - bimmerforums is a good one.
From a simple google search - Google is your friend...
I reset the CEL and it returned with just the P1421 and P1423 code. I researched the web and found that on the BMW, this is the secondary air pump for cylinders 1-3 that provides air to the exhaust during warm up. According to others, this may be due to a check valve stuck open or closed. Or, it could also be a leak in the output hose or a vacuum hose to the valves. The vacuum line runs close to the engine causing it to get brittle and crack. This 30 cents hose can cause the valve to stay closed, keeping water in the pump and eventually, corrosion to occur. I'll work on it over the weekend and post my results.
Low vacuum to the check valve. Found the Electric Valve Switch leaking vacuum. PN 11-74-7-537-612 $43.55.
Posted on May 31, 2009
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Posted on Jan 02, 2017
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