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Joined: Apr 2002
Posts: 8
Junior Member
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OP
Junior Member
Joined: Apr 2002
Posts: 8 |
Hi All. This is the next chapter of the saga with my '98 V6 AT Contour that started with an earler post of mine . I have now replaced: - both pre-cat O2 sensors
- the fuel filter
I've inspected and found no problems with: - EGR valve
- extra air pipes that feed Bank 1 (the rear)
- throttle body
- AFM sensor
I also ran a can of Chevron FI cleaner through it. Yet I still get these two codes: - P0171: System Too Lean (Bank 1)
- P1131: Lack of HO2S11 Switches - Sensor Indicates Lean
So I was wondering if anyone can tell me what I logically should go after next, and how I should go about doing it. How would Pepper's OBD-II software make my diagnostic life easier? I'd definitely rather spend the money on tools than at the dealer ... At this point, it seems to me that I've pretty much done everything but - replace PCV
- replace spark plugs
- inspect / replace injectors
What have I overlooked that could be causing this very-Bank-1-specific problem? Thanks in advance for any help and/or insight you can lend me ... Regards,
Andrew
'98 Contour V6 AT
bone-stock, 85,000 miles
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Joined: Jun 2002
Posts: 14
Junior Member
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Junior Member
Joined: Jun 2002
Posts: 14 |
if you haven't already reset your computer (which you probably already have), after doing all this work, you might try it by taking off the battery cables for about 5 minutes. then see if the code comes back on.
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Joined: Mar 2002
Posts: 1,040
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Joined: Mar 2002
Posts: 1,040 |
Your prior thread ended with CEL off, so presumably it returned and you changed the parts noted.
I do not know the items you refer to as "extra air pipes" and AFM sensor please explain. Also codes only indicated bank 1 (rear) O2 sensor why did you replace sensors in both banks? You did replace the upper sensor, below the coil pack, at the firewall, correct?
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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Joined: Apr 2002
Posts: 8
Junior Member
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OP
Junior Member
Joined: Apr 2002
Posts: 8 |
then see if the code comes back on. I have a code reader, and can reset the codes that way. The code comes back within 20 miles of mixed city/highway driving. Very consistent. I do not know the items you refer to as "extra air pipes" and AFM sensor please explain By "extra air pipes" I mean the piping that goes between the intake bellows and the very rear of the intake manifold, next to the EGR valve. Air flows through the Air Flow Meter (AFM, or whatever Ford calls it), through the in-line PCV and then into that spot at the rear of the intake manifold, which is where Bank 1 is. There's a plastic resonance tube, about 1" in diameter and 15" long, that runs fore-aft in that area. I took it all off and checked for leaks, cracks, etc. but it all seemed OK. If there were a leak, then that would cause that bank to run lean, since that would be a leak of unmetered air. why did you replace sensors in both banks? I just felt like doing them both at the same time ... car has 85,000 miles on it. You did replace the upper sensor, below the coil pack, at the firewall, correct? Yes, and it was not fun.
Andrew
'98 Contour V6 AT
bone-stock, 85,000 miles
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Joined: Dec 2001
Posts: 237
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Joined: Dec 2001
Posts: 237 |
The following is from the Ford TSP (Technical Service Publication):
H40 DTCs P1131, P1151, P1132 AND P1152: UPSTREAM HO2S(S) NOT SWITCHING. DTCs P1130 AND P1150: FUEL SYSTEM NOT SWITCHING AT THE ADAPTIVE LIMITS (RICH OR LEAN)
Diagnostic Trouble Codes (DTCs) P1131 bank (1) (Cylinder #1) and P1151 bank (2) indicate the fuel/air ratio is correcting rich for an overly lean condition. The HO2S voltage is less than 0.45 volt. DTCs P1132 bank (1) (Cylinder #1) and P1152 bank (2) indicate the fuel/air ratio is correcting lean for an overly rich condition. The HO2S voltage is greater than 0.45 volt.
DTCs P1130 and P1150 indicate the fuel control system has reached maximum compensation for a lean or rich condition and the HO2S is not switching.
DTC/HO2S Reference List
-- HO2S-11 = DTCs P1131, P1132 and P1130
-- HO2S-21 = DTCs P1151, P1152 and P1150
Possible causes:
Fuel system
-- Excessive fuel pressure.
-- Leaking fuel injector(s).
-- Leaking fuel pressure regulator.
-- Low fuel pressure.
-- Contaminated injector(s)
Induction system
-- Air leaks after the MAF.
-- Vacuum leaks.
-- Restricted air inlet.
-- PCV system.
-- Fuel purge system.
-- Improperly seated dip stick.
EGR
-- Leaking gasket.
-- Stuck open EGR valve.
-- Leaking diaphragm.
Base engine
-- Oil overfill.
-- Cam timing.
-- Cylinder compression.
-- Exhaust leaks before or near the HO2Ss.
* Check air intake for leaks, obstructions and damage.
* Check air filter, air filter housing for blockage.
* Verify integrity of the PCV system.
* Check for vacuum leaks.
Hope it helps.
1996 Contour SE Sedan 4D (Royal Blue)
Duratec V6 2.5L 24-valve DOHC
Automatic
75,000 miles
No Mods (unless you call the DMD a mod)
Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).
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Joined: Dec 2001
Posts: 237
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Joined: Dec 2001
Posts: 237 |
Originally posted by Andrew Kalman:
How would Pepper's OBD-II software make my diagnostic life easier? I'd definitely rather spend the money on tools than at the dealer ...
Vehicle Explorer can read & store real-time values from over 100 different data items. For example, in your case, you could read the 02S11, 02S12, 02S21, and O2S22 (upstream and downstream oxygen sensor input voltages) values. I usually like to take the values and plot them in MS Excel. If you did this with the O2 values above, you should get a line in the shape of a sine wave (it should go up and down smoothly) if the system is working correctly. In your case, you could also check other values, such as the EGR system, fuel pump system, etc., to make sure that they are not contributing to the problem. Hope this helps.
1996 Contour SE Sedan 4D (Royal Blue)
Duratec V6 2.5L 24-valve DOHC
Automatic
75,000 miles
No Mods (unless you call the DMD a mod)
Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).
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