how do i troubleshoot dtc 41

1993 LEXUS LS 400
320,000 MILES
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MIKEMECHANICRR
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tune up parts look like new. fuel pump and filter are new. both tps units are new. car acts up after approx 1 hour,and only when its raining.i keep coming up with code 41.i did the lexus method of tps adjustment.
Feb 28, 2012 at 6:53 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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