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1994 Ford F-150 XL 5.0L Hesitation, Surge, MIL Lamp on, No Power on accel.
When vehicle is first started the o2 sensor switches normally. After it warms up the voltage stays very low around 100Mv. If you accelerate the engine the o2 voltage goes to -800Mv. Yes thats negative voltage. When this happens the engine is very sluggish on a...
FIX posted 1/9/2001
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Related Documents & Media 
| VIN | 1FTEF15N2R |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SFI |
| Emissions | FEDERAL |
| Symptoms | Hesitation, Surge, MIL Lamp on, No Power on Accel. |
| Occurs | Hot, on Accel |
| Misc. | 5.0L Sfi |
Trouble Codes
| 121 | Closed throttle voltage high or lower than expected. |
| 172 | Lack of O2 sensor switches. Indicates lean. |
| 173 | Lack of O2 sensor switches. Indicates rich. |
Message Closed w/FIX
Vehicle Data
1994 Ford F-150 XL
| VIN | 1FTEF15N2R |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SFI |
| Emissions | FEDERAL |
| Symptoms | Hesitation, Surge, MIL Lamp on, No Power on Accel. |
| Occurs | Hot, on Accel |
| Misc. | 5.0L Sfi |
Trouble Codes
| 121 | Closed throttle voltage high or lower than expected. |
| 172 | Lack of O2 sensor switches. Indicates lean. |
| 173 | Lack of O2 sensor switches. Indicates rich. |
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