rolandlang46
Lexus GX Rough Running
Summary of the thread
A 2023 Lexus GX hybrid with 220,000 km was experiencing rough running and jerking under acceleration, with the check engine light on. The owner suspected an exhaust leak as the cause. It was suggested that a pre-catalytic converter exhaust leak could skew O2 sensor readings, affecting fuel trim and causing the issue. After professional diagnosis and repair of the exhaust leak, the vehicle's performance improved significantly.
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4 comment(s)
rolandlang46 (community.author)
Plugs and air filter were done recently. I haven't checked for misfires specifically. How would a small exhaust leak cause this kind of issue?
tobiasschaefer12
If it's pre-cat, the O2 sensor readings could be skewed, messing with the fuel trim and causing the jerking. Those readings could also trigger those specific CEL codes. Still, I'd hook it up to a diagnostic machine and then check the leak if you really suspect it. Better let professionals have a look.
rolandlang46 (community.author)
Thanks. Turns out you were spot on about the exhaust leak messing with the O2 sensor. Shop found and fixed it for 265€. Runs like new now.
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LEXUS
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GX
tobiasschaefer12
Rough running on a hybrid GX with those kilometers could be a few things. Have you checked the usual suspects like air filter, spark plugs, or even for engine misfires? Fuel injectors could also be playing up.