What are Common Problems with Lexus GS 300?
Your GS 300. It's quintessentially Lexus -- enviably comfortable, luxuriously appointed, a ride quality unlike any other. Popular as the car is, though, it's not without some issues, notably, during the 1990s and early 2000s. Stay on top of them, and it should last you decades and hundreds of thousands of miles. Here's a few you should keep an eye out for, and what to do if you run into them.
Bad Oxygen Sensors
Check Engine lighting up on the dash? Most likely, the O2 sensor's failed. GS 300 models from 1994 and between 1998 and 2006 had this problem. If yours has 100,000 miles or more on the odometer, it might still. Best thing to do is replace the sensor; you should be good to go.
Faulty EVAP Systems
Lexus envisioned GS 300 as an upscale variation on the Lexus ES theme. So, its issues are thankfully few, and straightforward. One of the less problematic ones: a bad evaporative emission (EVAP) canister or a loose or worn-out gas cap.
You've probably got one or the other if you see Check Engine lit up on the dash. You'll run into this, most likely, if your model's from between 1998 and 2001, too, or from either 2003 or 2006, and it's got anywhere from 30,000 to 200,000 miles or so on it. Double-check fault codes first, but replace whatever's necessary. If you're not sure what to do, exactly, bring the car into a certified Lexus service center; the pros can help take care of things.
Failed Suspension Parts
If you're driving a GS 300 from between '93 and '97, 1999, 2001, 2003, or 2006, and it's got 100,000 miles on it or more, there's a good chance you've heard a clunk in the front suspension. That's usually a faulty shock mount -- the top one on the front shock. You'll have to replace it.
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