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1996 Mercury Grand Marquis LS 4.6L MIL Lamp on, pre ignition
Customer came in about a month ago with MIL lite on, codes P0420 and P0430 stored. Went through all tests noted and only problem found was the BARO reading was 140 Hz which would have indicated 6000 ft. above sea level and we are at sea level. Replaced the MAF...
Summary posted 12/1/2000
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| VIN | 2MELM75W7T |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp on, Pre Ignition |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
| P0430 | Catalyst Efficiency Below Threshold (Bank 2) |
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Vehicle Data
1996 Mercury Grand Marquis LS
| VIN | 2MELM75W7T |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp on, Pre Ignition |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
| P0430 | Catalyst Efficiency Below Threshold (Bank 2) |
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