Sonata Fuel Trim Code

^ The Sonata engine management system will only set one Fuel Trim code. Code P0170 will set when the "Long Term" Fuel Trim values are "Rich" or "Lean" beyond the programmed limits.

^ The "Long Term" Fuel Trim correction range is -12.5% to +12.5% on Sonata vehicles. If the "Long Term" Fuel Trim value exceeds this range in two consecutive trips, a code will be stored in the PCM.

^ The Fuel Trim values will indicate if the PCM is compensating rich or lean. A PCM that is increasing fuel delivery (to compensate for a "Lean" condition) will have a positive (+) "Long Term" Fuel Trim number. A PCM that is decreasing fuel delivery (to compensate for a "Rich" condition) will have a negative (-) "Long Term" Fuel Trim number.