Check Engine light..
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Junior Member
Joined: Sep 2010
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2011 E350 & 996 911
Check Engine light..
It came on while I was driving but the car seems to be driving normally. I think it could be that an O2 sensor went out. Can I take my car to autozone and have them read the code? Anybody know if they can do that?
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 51
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2011 E350 & 996 911
had autozone check the code and it said "secondary air injection system fault" but then I asked my local mechanic and he said it's not a problem to drive but he would check it out if I wanted. I went home for a while and when I got back in to drive to work, the check engine light was off.... so maybe a sensor was just acting up or something.
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05 C230K SS (sold), 06 C55 (sold), 08 Yamaha R1 (sold), 16 X5M
mayhbe...altough it'll probably go off again...my guess is that what ever is acting up isn't completely broke but maybe is getting stuck open/closed or something...what exactly is the 2ndary air injection system? something around the MAF or something?
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
secondary air injection system consists of the air pump and valves to allow that extra air during the first minute after starting (warm-up period). One of the valves (that allow the extra air) must be sticking. It's not that hard to remove those valves and clean them. Black soot tends to form inside those valves and not allowing the diaphram in those valves to move freely.
Last edited by pcy; Oct 21, 2010 at 11:21 AM.
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MBWorld Fanatic!
Joined: Mar 2004
Posts: 1,175
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
