okay this really sucks I have a 1999 Mazda Millenia s 2.3 liter supercharged earlier I had a code of P 0170 and P 0173 now all I have is a code of P 0173 but now I also have a code of P421 can anybody please help me with this problem and tell me what the problem more than likely is

Asked by Apr 02, 2013 at 11:18 PM

Question type: Maintenance & Repair

2 Answers

http://www.obd-codes.com/trouble_codes/mazda/

18,525

look for a vacuum leak around engine, lines and Tees, air intake at hoses will lean out the mix, fuel trim will show on scanner

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