shopper
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I spent hundreds, maybe thousands of dollars over the life of my 2000 RX300 trying to resolve the P0171 error. I've had O2 and Mass Air Flow Sensors replaced numerous times to no avail. The car always ran fine except for straining, pinging and loss of power when climbing. I had been using regular gas for 16 years and decided to try a higher octane - 91. Voila! No more trouble climbing, no pinging, and best of all the error code is gone!
