Hey Guys, I am new to the Thread. I just wanted to say that I had Issues with my Lexus IS250 which has 150 000 Canadian Km. one Day I lost power and the Car would not accelerate . I had to pull over . Turn off the car then turn it back on . A week after the Engine light came on with message check VSC and Traction control light came on as well. I took it to Lexus and they told me Error Was P0420 Bank 1 was the issue and suggested replacing the catalytic converter for $1500. I took it to my local mechanic for full inspection and suggested to replace my Spark Plugs as they are over due then the Oxygen sensor then the Catalytic converter at the very end. first thing i did was change my Spark Plugs with brand new OEM ones . Lexus wanted to charge me $85 per Spark Plug. Lexus Is250 needs 6 spark plugs. So you do the Math. I went on Ebay and Found 6 OEM brand new plugs for $80..................... :) . my Mechanic had them replaced under 2 hours and guess what........ No more Traction control or engine light for the past 3 weeks. I drive the car daily at least 60 km/day. Now If you have the P0420 error Here is where I recommend.
1. Check your gas tank cover, gas tank neck shield. make sure it is not broken
2. If you always used cheap gas and not premium you might have carbon build up
3. In my case . Spark plugs were not changed since it was initially purchased. Lexus Recommond you change them every 80-100k.
4. Change the O2 Sensor for B1 if you have P0420 error
5. Check for Leaks. I also had a small leak under the Heat Shield.
6. Perform Full car Inspection which cost only around $80 at Canadian Tire or local mechanic.
If none of these option work for you. I would then suggest changing your Catalytic converter .