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Originally Posted by BlackEnigma
00 Max, about 135000 miles. Engine codes P0139 and P0430. Is there a way to check if the catalyst converter is bad without replacing O2 sensors? What are the consequences of not replacing the Catalyst Converter if its bad? Are there any consequences of not replacing O2 sensors if they are bad? I know I can't pass emissions, but I don't have to go again for a while. I am so strapped for money. I just had to replace the axles because of the terrible condition of both cV boots. I am slightly concerned as I have to drive over 700 miles from my home in Maryland to my school in Alabama this weekend. Tell me I am not endangering my life.
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All of these will result in a decline in fuel economy, but will not endanger your safety.
Unfortunately, your trouble codes are considered "jackpot" codes where there are multiple potential causes. I recommend seeing if you can hook up with someone who has had these codes before and seeing what their fix was. I have an SES light and have seen a 1 mpg decrease due to a bad 02 rear fault- but it may NOT actually be the rear o2- it could be 3-4 other things. It is really a crapshoot, and no dealership or repair shop will guarantee that what they do will actually FIX the problem, unless they just replace both o2s AND the cat...