Engine Burning Oil Problems of Mitsubishi Lancer

2 years ago I brought a new catalytic converter for my car from DE dealership. That cost me 496. 76$ few months ago the check engine turn in and when I check I have the code p0421. That is the code for the catalytic converter again. I couldn't believe it. I when to Mitsubishi 2 days ago and they told me that they couldn't believe it because I'm the first client that comes back for the same part. One of the employees check my car and he said that my car is burning oil. He told me that I have to change the valve lifter. Do I really need to do that then buy a new catalytic converter?.

See all problems of the 2003 Mitsubishi Lancer 🔎.

My car was purchased on 11/23/05. One week after purchase, service manager informed me that my oil was really low and added a quart of oil. He advised me to check the oil level regularly. I noticed that I had to add a quart of oil every 1,000 miles or so. I voiced my concern to the service manager when I had my first oil change and was told that "a quart of oil loss per 1,000 miles is normal". I checked my oil regularly to avoid any problems until one day, I found out about oil consumption tests. I told the service manager about it and he arranged to have it done on my next oil change. The first oil consumption test revealed abnormal results which prompted them to repair the problem. Another oil consumption test was done and it showed a more favorable result. I check the oil level regularly and still notice that I add a quart of oil every 1,000 miles. I spoke to the service manager about it and was told that it was normal. I went to another dealer to have the oil consumption checked. The first oil consumption test revealed a quart of oil loss per 1000 miles and the second test revealed an abnormal result of a quart and a quarter oil loss per 1000 miles. I was then told by the service representative to contact Mitsubishi corporate office to report the result. Now I'm asking for your assistance in solving this problem. Thank you.

See all problems of the 2005 Mitsubishi Lancer 🔎.