leoJr
Member
- Joined
- May 27, 2007
- Messages
- 45
- Reaction score
- 7
- City, State
- Denton, TX
- Year, Model & Trim Level
- '99 XLT 5.0 auto 2wd
'99 Explorer, 5.0, auto, 185,000 miles on it, is bone stock and has recently had new plugs and wires installed.
About 3 weeks after the plugs/wires were replaced the Check Engine Light (CEL) came on.
I have an Auto Enginuity (AE) and by no means do I know how to use all of its capabilities. But I can set it up to watch all 4 O2 sensors, read and clear codes, and run the Key On Engine Running test.
Originally the B2S1 O2 sensor wasn't reading right. I don't recall if the voltage was high or low, but it was steady at one extreme. Not moving up and down like the other three.
I moved B1S2 into its place as it was reading good and the B2S1 position was harder to get to. I had the truck on ramps and chose to make do the hard work now, and when I got the replacement O2 sensor I could reach and change the B1S2 without ramps.
After this I ran looked at all 4 sensors on the AE and sure enough, B2S1 was moving like the others and B1S2 was steady.
New sensor arrived and swapped it into the B1S2 position.
Cleared the codes with the AE and ran the KOER test, then looked at the 4 O2 sensors...all were moving lively and the LTFT Bank One and Two and STFT Bank Two were all green. I did not note any of the O2 Sensor Fuel Trim at that time...I didn't know the readings were available so I didn't know to look for them.
A week later the CEL came on again.
AE shows the LTFT Bank One and Two and STFT Bank Two are all green.
Both S1 sensors read lively.
Both B1S2 and B2S2 Output Voltage are zero. 0.0 specifically.
Both B1S2 and B2S2 Sensor Fuel Trim are pegged at %99.06. The S1 position for both are green.
I don't know what these mean, but the KOER test showed the:
Bank 2 Switch Ratio and Max. Limit colored red at .827
Initial Tank Vacuum Bleed-up and Threshold colored red at -7.467
Vapor Generation Max. Pressure Rise colored red at -63896
Any chance these are causing the S2 position O2 sensor issues and what can I do to fix them?
Thanks in advance for the input.
About 3 weeks after the plugs/wires were replaced the Check Engine Light (CEL) came on.
I have an Auto Enginuity (AE) and by no means do I know how to use all of its capabilities. But I can set it up to watch all 4 O2 sensors, read and clear codes, and run the Key On Engine Running test.
Originally the B2S1 O2 sensor wasn't reading right. I don't recall if the voltage was high or low, but it was steady at one extreme. Not moving up and down like the other three.
I moved B1S2 into its place as it was reading good and the B2S1 position was harder to get to. I had the truck on ramps and chose to make do the hard work now, and when I got the replacement O2 sensor I could reach and change the B1S2 without ramps.
After this I ran looked at all 4 sensors on the AE and sure enough, B2S1 was moving like the others and B1S2 was steady.
New sensor arrived and swapped it into the B1S2 position.
Cleared the codes with the AE and ran the KOER test, then looked at the 4 O2 sensors...all were moving lively and the LTFT Bank One and Two and STFT Bank Two were all green. I did not note any of the O2 Sensor Fuel Trim at that time...I didn't know the readings were available so I didn't know to look for them.
A week later the CEL came on again.
AE shows the LTFT Bank One and Two and STFT Bank Two are all green.
Both S1 sensors read lively.
Both B1S2 and B2S2 Output Voltage are zero. 0.0 specifically.
Both B1S2 and B2S2 Sensor Fuel Trim are pegged at %99.06. The S1 position for both are green.
I don't know what these mean, but the KOER test showed the:
Bank 2 Switch Ratio and Max. Limit colored red at .827
Initial Tank Vacuum Bleed-up and Threshold colored red at -7.467
Vapor Generation Max. Pressure Rise colored red at -63896
Any chance these are causing the S2 position O2 sensor issues and what can I do to fix them?
Thanks in advance for the input.
