I have a few questions about my cel light which came on a while back. I started repairing the 'issues' to rid myself of this light so I can get the mazdaratti inspected.
First, I had to replace the 'after cat' o2 sensor. Once that was replaced, there was another cel... That code said it was a vacuum leak or a fuel injector problem (P0171?). Anyway, I discovered that my air intake hose was cracked almost in half. After replacing the hose, I now have another code...the P0421.
My question is how do I know which cat to replace? I see there are two on my car; one is $300 and the other is $80... Since this thing has 120,000 miles on it I only want to spend what I have to. Any help is greatly appreciated.
First, I had to replace the 'after cat' o2 sensor. Once that was replaced, there was another cel... That code said it was a vacuum leak or a fuel injector problem (P0171?). Anyway, I discovered that my air intake hose was cracked almost in half. After replacing the hose, I now have another code...the P0421.
My question is how do I know which cat to replace? I see there are two on my car; one is $300 and the other is $80... Since this thing has 120,000 miles on it I only want to spend what I have to. Any help is greatly appreciated.