nothinbutroad
Member
- Joined
- April 29, 2012
- Messages
- 19
- Reaction score
- 0
- City, State
- Grand Terrace
- Year, Model & Trim Level
- 1991 ford explorer
code 42-exhaust gas oxygen(ego) sensor: voltage signal always "rich"(high value)-does not switch.
so i have nearly fixed my 91 explorer, all thats left is a code 42. i replaced nearly all my sensors(including a brand new 02 sensor), did a compression test on the engine, and my obd1 scanner came back with a code 42 during a koer, and passed with an 11 in the koeo. i have a smog test coming up in august and i need to fix this problem. what are some causes for an engine running rich? code 42 also says (does not switch) what does that mean? what would i need to do to make it switch? or what would be the first thing i check to narrow down my diagnosis? i greatly appraciate all help and advice.
so i have nearly fixed my 91 explorer, all thats left is a code 42. i replaced nearly all my sensors(including a brand new 02 sensor), did a compression test on the engine, and my obd1 scanner came back with a code 42 during a koer, and passed with an 11 in the koeo. i have a smog test coming up in august and i need to fix this problem. what are some causes for an engine running rich? code 42 also says (does not switch) what does that mean? what would i need to do to make it switch? or what would be the first thing i check to narrow down my diagnosis? i greatly appraciate all help and advice.