GS300dude Posted October 8, 2009 Share Posted October 8, 2009 okay today i took my 99 GS300 to a mechanic and did complete tune up and complete timing belt change, including most seals, water pump, thermostat etc.... now my problem is when I drove my car home the engine light came on (code: P0171 ) it says system too lean. Now what should I do? Quote Link to comment Share on other sites More sharing options...
Hillsndale Posted October 10, 2009 Share Posted October 10, 2009 Maybe the mechanic left something unplugged/unhooked? If you find something to plug back in, you will have to reset the code by unhooking your negative battery cable for a couple minutes. You will lose your radio presets. If you can't find anything simple, I would take it right back to the mechanic and ask why did that happen right after he worked on it. I would give him a chance to take a look before jumping too hard on him, there might be a reasonable explanation? Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted October 23, 2009 Share Posted October 23, 2009 okay today i took my 99 GS300 to a mechanic and did complete tune up and complete timing belt change, including most seals, water pump, thermostat etc.... now my problem is when I drove my car home the engine light came on (code: P0171 ) it says system too lean. Now what should I do? As Hillsndale suggests, if this happened right after the service, have your mechanic check all connections that might not be secure, sensors, vacuum lines etc. Quote Link to comment Share on other sites More sharing options...
sakataj Posted October 28, 2009 Share Posted October 28, 2009 isn't a P0171 a o2 code? check bank 1 o2 sensor from my recollection Quote Link to comment Share on other sites More sharing options...
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