Cause of BOTH P1131 and P1132???
#1
12-06-2002, 11:17 AM
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Cause of BOTH P1131 and P1132???
Hi,
I am trying to determine the most likely cause of getting both the P1131 and P1132 (HO2S not switching - LEAN and HO2S not switching -- RICH) error codes on my '97 Expedition. Seems strange that the problem could be both causing lean AND rich conditions. It also seems unlikely that the cause is a dirty MAF, even though I'm running a K&N air filter, since the problem is occuring only on one side. Is it as simple as the upper HO2S sensor gone bad?
Thanks!
I am trying to determine the most likely cause of getting both the P1131 and P1132 (HO2S not switching - LEAN and HO2S not switching -- RICH) error codes on my '97 Expedition. Seems strange that the problem could be both causing lean AND rich conditions. It also seems unlikely that the cause is a dirty MAF, even though I'm running a K&N air filter, since the problem is occuring only on one side. Is it as simple as the upper HO2S sensor gone bad?
Thanks!
#2
12-08-2002, 01:56 AM
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If the code is "H02S11 not switching, indicates rich and lean" or something of that sort then, I would guess that you have a bad 02 sensor. If it is the one on the passanger side, check for the evaporator drain tube leaking onto the 02 sensor. I know there was a TSB for this, but I am not sure what engine(4.6, 5,4) and what DTC's codes you will recieve.
#3
12-08-2002, 09:52 AM
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Change the O2 sensor, I just went through this for two months. I tracked down everything that could cause these codes. In the end it was just a bad O2. I currently have 84,000 miles on a 1998 F-150. If you are getting up there in milage like 60,000 or more miles then the O2 sensors will start failing.
Good Luck
Good Luck