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1997 Mercury Grand Marquis GS 4.6L MIL Lamp on
ABOUT 2 MONTHS AGO CUST CAME IN WITH THE MILL ON. THE ENGINE RUNS REAL GOOD. REPLACED THE TWO UPSTREAM H2OS, BUT CAME BACK IN TWO WEEKS, WITH SAME CODES. i REPLACED THE ERG VALVE ASSY, BUT DIDNT SEEM TO FIX PROBLEM. THE SAME CODES KEEP COMING ON MEMORY P0420 L...
FIX posted 1/4/2004
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48 Replies Received
48 Replies Received
Related Documents & Media | VIN | [No VIN Available] |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
| Misc. | Mill on Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed
Vehicle Data
1997 Mercury Grand Marquis GS
| VIN | [No VIN Available] |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
| Misc. | Mill on Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Video