My lexus es300 starts ok but after a mile or so it will start to stumble and lose power. It will usually only go around 45 mph and if you stop it takes forever to get up to 35. The car won't go into overdrive because the transmission drops into a low gear and then back to drive and back and forth. I toolmk it to auto parts store to read the heck engine code and it came back PO302,P0300, P0304,P0330,P0420,P0430
What makes this problem better or worse?
It's worse when the engine gets warm
How long has your 2002 Lexus ES300 had this problem?
RepairPal Certified shops can diagnose and repair your 2002 Lexus ES300. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hey, my name is Dusty, and I'm one of the auto experts on RepairPal's Car Genius team. I'm here to help!
Hey there! Given the range of codes you've got, it sounds like your Lexus ES300 has quite a few issues. Here's a quick rundown of what each code generally means and some possible causes:
Since you have multiple Misfire Codes (P0302, P0300, P0304), various issues can cause them, including spark plugs, ignition coils, fuel injectors, or even mechanical problems within the engine.
Knock Sensor Code (P0330): The sensor detects engine knocking or pinging, typically caused by the engine's pre-detonation. Given the vehicle's poor performance, it could also be a false flag or the result of a simple wiring issue.
(P0420, P0430): These codes indicate that the catalytic converters are not operating efficiently; they may be clogged or restricted and could be the source of the acceleration (or lack thereof) issues.
It's vital to analyze freeze-frame data from the diagnostic scan to tackle these intricate and interlinked issues, especially the fuel trim values.
These values offer valuable insights into whether the engine is running lean or rich, aiding in identifying the causes of misfires and efficiency concerns.
A knowledgeable technician can evaluate this data to pinpoint underlying issues, examine pertinent systems, and offer steps to resolution.
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