flashing Check Engine Light and scan shows no codes

Asked by Shannon Feb 06, 2019 at 08:38 AM about the 1999 Lexus RX 300 AWD

Question type: Maintenance & Repair

A few weeks ago my 1999 Lexus RX300 started running rough and using
more gas than usual. The check engine light had been on since I bought it in
September but there had been no issues before this. Took it to Advance
Auto and had the computer scan done, Cylinder 1 and 6 misfires. Replaced
all coils and spark plugs, reset the light. Ran good for about 3 days then it
was hard to start and keep running, figured it was cold natured and began
warming it up for 15 minutes or more before driving. A couple more days
later the check engine light flashed a few times, car acted like it had died (no
power and seemed to have cut off), then the car was shaking and acted like
it had been shifted down suddenly (transmission revving and RPms racing).
My dad ran a scan on it, but no codes or anything show up. The check
engine light only comes on during these episodes, which last only a few
seconds, and seem to happen more when it's cold (the weather or the car)
and when I take my foot off the gas pedal to slow down. What could be
causing this?

2 Answers
40

Josh answered 5 years ago

I have a 2001, it acted like this, but did throw a code. In my case, the o2 sensors were bad. If this is the case, both sensors and the wiring harness need replaced. It is a major job, the entire intake manifold needs removed from the engine and is about 7 hours of labor. I'd expect to pay between $1,400-$1,600 at a dealer. I have a mechanic friend that does all my work, cost me $700, highest bill I ever had from him. Almost everything on the Lexus 3.0 v6 is expensive and difficult to fix. It is my understanding that the o2 sensors typically go between 90,000-100,000 like clock work. Mine went at 94,000.

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20

Guru9ZVKYT answered 3 years ago

I change a up stream o2 sensor in 30 mins. 5 mins. out 20 mins. for wiring. Put a plug on new sensor. 5 mins to install back. I would do the job for $100 plus part.

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