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			Got a check engine light while driving yesterday.  Today I took it to mechanic and he got two errors.  1.  O2 sensor faulty (the less important one?)  and 2.  Cylinder 2 is misfiring.  Two questions:  How much is O2 sensor and where is it?  And second, what is the most common and some less common problems for a cylinder to misfire?  Is it a spark plug problem usually?  Thanks for the info. 
		
		
		
			
		
		
		
		
		
			PS: I don't think I can attribute these two problems to DRIVING HARD, necessarily. >  
			
				
			
		
				__________________ 
		
		
		
		
		
	
	2006 E350 w/ 155k miles (Daily Driver) Previous: 1993 300E 3.2L Sedan w/ close to about 300k miles 2003 E500 Brilliant Silver (Had 217k miles when totalled!) 1989 300E with 289,000 miles (had for <1 yr while in HI) 03 CLK 500 cabrio (Mom's) 2006 C230k (Dad's) 1999 S420 (Mom's/Dad's) 2000 C230k Sport sedans 2001 CLK320 Cabrio (Mom's) 1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)  | 
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