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19/05/2025 9:59 am
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2005 Toyota Sienna 194,000 miles 3.3 liter V6
ECU continues to set P0171, P0174, and P0420 trouble codes. Vehicle runs fine, fuel economy is not affected. Any possible solutions?
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19/05/2025 10:54 am
Being 20 years old it could be any number of things. Basic problem appears to be a lean condition. What troubleshooting have you done so far? Checked for vacuum leaks? Cleaned throttle body and MAF sensor? Since there are codes set there should be freeze-frame data, anything suspicious there? Have you looked at live data to check fuel trims and sensors?
