Possible Sensor Problem, Running Lean?

[ggloversr]

I have had most of the sensors changed including the knock sensor and the computer still says the engine is running lean. Any suggestions on what may be causing the problem?

The car is a 2000 RX300 4wd with 107,000 miles on it.

[lenore]

I have had most of the sensors changed including the knock sensor and the computer still says the engine is running lean. Any suggestions on what may be causing the problem?

The car is a 2000 RX300 4wd with 107,000 miles on it.

I wonder if you have a cracked exhaust manifold, leaking air in....

[RX in NC]

Yep, cracked exhaust manifolds are a very common defect in 1999 and 2000 RX300s. My wife's previous 2000 RX300 suffered a cracked exhaust manifold at approximately 45,000 miles. Often times when the manifold cracks, no codes are thrown so it can be difficult to diagnose unless you know about the issue with these vehicles. Have it checked out....

[ggloversr]

Thanks, I'll have the manifold checked next..