sv650rx300

For code P0171: 9 out of 10 times, if you can't get the MAF sensor clean, you need a new one. There are literally hundreds of posts on the internet about this problem (not just involving Lexus/Toyota). Almost all end up with a new MAF. Rockauto (www.rockauto.com) will sell you a rebuilt MAF for less than $80. A new MAF is $140-$300 depending on who makes it and who sells it. Having said that, the other items worth looking at are: air leak, fuel pressure, clogged injector, coolant temp sensor, or 02 sensor. Ericok, Thanks for the reply. I did clean MAF sensor before with alcohol. I wasn't comfortable with the cleaning. Therefore yesturday I bought CRC MAF cleaner sprayer and clean the sensor. Also - this time instead the resetting the engine light error code, i did recycle the power by diconnecting battery. So far i haven't seen light come on since yesturday. I hope it keep that way. The site (www.rockauto.com), i check the price for MAF. I got confused with pricing. The first column says $71 than second column heading core said $49. what is this core price for? I also had P0171 on my 2000 RX300 AWD, about 70,000 miles I think it is fixed now, because light has not come on and it has about 70 miles and probably 10 times engine on/off since the last code reset (disconnected battery). I saw two problems when fixing the car: 1. Bad air/feul ratio sensor bank 1 sensor 1 (resistance was virtually zero, meaning heater circuit is short) 2. Damaged O-ring on MAF sensor. I carefully cleaned the sensor using a small paint brush and electrical contact cleaner. Then I put a new O-ring, coated with light engine oil on the sensor. If the CEL comes on again on mine, I think I'll check fuel pressure. But as I mentioned, it is probably fixed. Sometimes O-ring was overlooked, leakage might be enough to cause CEL. Good Luck.