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Posted

RE: 99 RX300, I did the search and still have the following question:

Shop manual says P0171 could indicate problem with MAF, ECT sensor or Bank 1,2 Sensor 1 (A/F Sensors) among other things. I get only P0171 and no other codes relating to MAF, ECT or A/F sensors. Does that mean I can rule out these items?


Posted

More than likely the MAF is the problem. Can you get access to the datalist and read it?

Posted
P0171

Fuel Trim System Lean (Bank 1)

Bluestu, my shop manual doesn't specify Bank 1 - just says Fuel System Lean. MAF checks out perfectly, electrically speaking. I did clean it although it wasn't very dirty. Put it back together and started car. Idle soeed was low. Askled wife about it and she said this problem started about 3-4 days ago. Tore her down tonight and removed IACV. It wasn't gunked up too badly but IACV open circuit had no continuity. I am very disappointed that IACV failed at 78k miles. Just a few months ago I had to replace an A/F sensor - pretty pricey too because I have a CA spec car.

Can't believe this "Pursuit of Excellence" Lexus is already starting to nickle and dime me at less than 80K. Oh well, at least the trans hasn't failed, yet.

BTW, should I consider an aftermarket IACV or stick with Toyota OEM?

  • 4 weeks later...
Posted

I am getting this code. I have replaced the IACV, MAF, Spark plugs- thinking Emmisions components valve next or maybe the map sensor (does anyone know what & where that is??) I will have rebuilt this darn thing after a few more parts. Its a 99 rx300 over 100k. Idleing down & black smoke /p0171 code. Any ideas?

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