Peter Foley
New Member
- Joined
- January 3, 2019
- Messages
- 8
- Reaction score
- 0
- City, State
- Seward
- Year, Model & Trim Level
- 1998 Ford Explorer Sport
Hello, 1st post here!
I have an explorer 4.0 ohv that has 2 codes on it: P0171 and P0174. They are for "system too lean" for banks 1 and 2. When looking at the live data from my obd2 scanner, I see 0 volts and short and long term fuel trims at -100%. I have tried this obd2 scanner on other cars and it does read oxygen sensor voltage and fuel trims correctly. Strangely enough, when I put a piercing multimeter on the signal wire as it comes out of the o2 sensor, I get a reading. I have tried to visually inspect the wiring as far as I can see it and it looks in good shape. I have also, replaced both upstream o2 sensors, but to no avail, still no voltage reading from the obd2 scanner. So, my questions.... Is the no voltage situation causing the lean codes, or is there a lean condition that is causing the o2 sensors (which could be functioning properly) to read 0 volts because the engine is running so lean. Is this possible? Also, I did do a smoke test, and there was a tiny bit of smoke coming out of the intake gasket, is this vacuum leak bad enough to make a properly functioning oxygen sensor read o volts? Thanks for any help and suggestions!
I have an explorer 4.0 ohv that has 2 codes on it: P0171 and P0174. They are for "system too lean" for banks 1 and 2. When looking at the live data from my obd2 scanner, I see 0 volts and short and long term fuel trims at -100%. I have tried this obd2 scanner on other cars and it does read oxygen sensor voltage and fuel trims correctly. Strangely enough, when I put a piercing multimeter on the signal wire as it comes out of the o2 sensor, I get a reading. I have tried to visually inspect the wiring as far as I can see it and it looks in good shape. I have also, replaced both upstream o2 sensors, but to no avail, still no voltage reading from the obd2 scanner. So, my questions.... Is the no voltage situation causing the lean codes, or is there a lean condition that is causing the o2 sensors (which could be functioning properly) to read 0 volts because the engine is running so lean. Is this possible? Also, I did do a smoke test, and there was a tiny bit of smoke coming out of the intake gasket, is this vacuum leak bad enough to make a properly functioning oxygen sensor read o volts? Thanks for any help and suggestions!