I doubt the original o2 and the new o2 were both faulty and gave the same code. P0136 is out of range either too rich or too lean. Check fuel pressures, air leaks, maybe even a leaky injector. replacing the downpipe cat with another used cat is always risky... you never know the condition of it. if your out of ideas, find someone with a scanner that can do a real time data logger and see whats going on with the readings. You might have to bite the bullet on this one and pay someone to find out. better than throwing random parts at your car...
Last edited by SpeedFactor; 02-27-2014 at 10:38 PM.
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