1996 Lexus LS400 Q&A
1996 Lexus LS400 Question: Lexus shudders while driving. Is catalytic converter the most likely problem?
When we bought the car the engine light was on and dealer said it was O2 sensor. They replaced sensor and light went off for a few hundred miles. Light came back on and code is for catalytic converter. P0420 Cat Sys Efficiency Threshold That was two years ago (still trying to get dealer to fix problem). In the past week the car shudders-almost feels like it is downshifting and upshifting or like hitting a patch of ice where car slows and then catches and speeds up. We had the code cleared and checked and still only says catalytic converter. Thank you in advance. - Bgriff
cat is bad and needs to be replaced. the other issue is most likely the torque converter in the trans. it most likely has to be removed and overhauled. Roy - mastertech6371
DO NOT BUY A CONVERTER U WILL BE WASTING MONEY........SCAN TOOLS ARE HELPFUL BUT WRONG ALOT OF THE TIME.....YOU HAVE A AIR LEAK.......AND THE AIR LEAK IS OVERLOOKED BY PROFESSIONALS BECAUSE THEY ARE GONNA RIP YOU OFF....I HAD SAME PROBELM.....IT COST ME 79CENTS TO FIX,,,SAD HOW PEOPLE ARE SO DISHONEST - DABLOCK2K3