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Old 02-11-2010, 06:37 AM   #1 (permalink)
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Should I be worried about error code P1420

Thiis is the secondary air valve control circuit electrical. Anyone have any ideas on how to fix this or if it's a problem I should be concerned with?

I also got an error as P1384 which is "knock Sensor 3 Circuit" which appears to be as the description says the system is sensing engine knock or is the sensor not functioning and that is the problem. As I don't hear any type of knocking in the engine which runs very smooth (99' 540i with 130k).

The CEL came on with the onset of really cold weather -40F at the same time power steering fluid began leaking and air lock appeared in rad (fixed the coolant problem and topped up the PS fluid pending warmer temps to fix the hoses)
1999 BMW 540i 6 spd

Last edited by wayned; 02-11-2010 at 06:53 AM.
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Old 02-11-2010, 06:44 AM   #2 (permalink)
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If these codes all appeared at -40f, I would wait until the warmer weather comes...very cold temps can do funny things to electrical sensors, so when it does get warm clear the codes , wait a week and see if they return, if the cars runs ok I wouldn't worry about it at the moment.....

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