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1998 Mercury Mystique LS 2.5L MIL Lamp on
this vehicle keeps triggering these codes, i have replaced the mass air flow sensor, and replrogramed the PCM as well as reset the KAM. [...] are at +18% while short term is -13%.at hot Idle, when you rev the eng over 3000 RPM the LTFT and STFT go closer to 0%...
Summary posted 4/12/2001
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Related Documents & Media 
| VIN | 1MEFM66L8W |
| Engine | 2.5 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SEFI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Hot, Idle |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P0174 | Fuel System Too Lean (Bank 2) |
Message Closed w/Summary
Vehicle Data
1998 Mercury Mystique LS
| VIN | 1MEFM66L8W |
| Engine | 2.5 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SEFI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Hot, Idle |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P0174 | Fuel System Too Lean (Bank 2) |
Video