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1991 Plymouth Sundance High Line 2.5L Excessive Emissions
Hello gang, Thanks for looking at this. This '91 Sundance failed IM240 on excessive NOx. We scanned for codes and got the 21, which was reading O2 shorted to voltage. Went thru MOD test and checked the O2 signal wire from the PCM to the sensor,from end to end....
FIX posted 3/3/2003
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Message Closed w/FIX
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| VIN | 1P3XP48K3M |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / TBI |
| Emissions | OBD1 - US Emission |
| Symptoms | Excessive Emissions |
Trouble Codes
| 21 | O2 shorted to voltage |
Message Closed w/FIX
Vehicle Data
1991 Plymouth Sundance High Line
| VIN | 1P3XP48K3M |
| Engine | 2.5 L / 4 cyl / GAS |
| Trans | 3-speed Automatic |
| Delivery | FI / TBI |
| Emissions | OBD1 - US Emission |
| Symptoms | Excessive Emissions |
Trouble Codes
| 21 | O2 shorted to voltage |
Video