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1997 Mercury Grand Marquis GS 4.6L Cat Monitor
I have this 97 Grand Marquis that will not run the cat monitor. The came in originally with a P0420 code, replaced both cats due to other bank not working so well. After replacing cats and front O2's (slow response), we have driven it for multiple drive cycles...
FIX posted 8/26/2009
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Message Closed w/FIX
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7 Replies Received
7 Replies Received
Related Documents & Media | VIN | 2MELM74W3V |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SEFI |
| Emissions | OBD-II Compliant |
| Symptoms | Cat Monitor |
| Occurs | Always |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed w/FIX
Vehicle Data
1997 Mercury Grand Marquis GS
| VIN | 2MELM74W3V |
| Engine | 4.6 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / SEFI |
| Emissions | OBD-II Compliant |
| Symptoms | Cat Monitor |
| Occurs | Always |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Video