I have been troubled by the service engine light coming on and the code says Catalytic Converter. Well I replaced the upper first and it cleared the codes for a few weeks and then back on so I had the lower catalytic converter replaced and light came back on. Now I'm looking at the upper unit may not be doing it's job so I'm going to file a claim with person I bought from on eBay and get it replaced with a different manufacturer. I probably got what I paid for CHEAP! Anyone had this same experience? Maxpeedingrods was the seller. Appreciate any input on this issue.