CEL PROBLEMS
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Joined: Jan 2008
Posts: 5
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CEL PROBLEMS
My 2002 GT with almost 60,000 miles on it(mods: Diablo chip and K&N air filter installed at about 30,000 miles) began to give me CEL codes on 12/3. The first three codes given were:
P1131 - Lack of HO2S11 switch - Sens Indicates Lean (Bank 1)
P1151 - Lack of HO2S-21 switch - Sens Indicates Lean (Bank 2)
P0174 - System Too Lean (Bank 2).
Only noticeable problem was RPM's decreased and engine seemed like it wanted to die when I was not moving. First attempts to correct problem included cleaning the MAF with MAF cleaner from Advance and replacing the IAC valve. I cleared the codes with my OBD-II tool.
The car ran fine for a few weeks until I noticed that the car seemed like it wanted to die again when car was not moving on 12/31. CEL came on again, with the codes now being:
P1131 (again),
P1150 - Lack of HO2S21 Switch - Fuel Trim at Limit (Bank 2)
P0171 - System Too Lean (Bank 1).
Last night, I disconnected wire from negative terminal on the battery and cleaned MAF again.This morning, I reconnected battery and started the car with the MAF connector disconnected. After driving less than 500 feet, I heard what sounded like a popping noise in my exhaust. This is the first time that this has ever occurred.
I plan to replace PCV valve today with Motorcraft PCV since they are cheap ($12) from dealer to see if that works.
Anybody have any ideas? Thank you.
P1131 - Lack of HO2S11 switch - Sens Indicates Lean (Bank 1)
P1151 - Lack of HO2S-21 switch - Sens Indicates Lean (Bank 2)
P0174 - System Too Lean (Bank 2).
Only noticeable problem was RPM's decreased and engine seemed like it wanted to die when I was not moving. First attempts to correct problem included cleaning the MAF with MAF cleaner from Advance and replacing the IAC valve. I cleared the codes with my OBD-II tool.
The car ran fine for a few weeks until I noticed that the car seemed like it wanted to die again when car was not moving on 12/31. CEL came on again, with the codes now being:
P1131 (again),
P1150 - Lack of HO2S21 Switch - Fuel Trim at Limit (Bank 2)
P0171 - System Too Lean (Bank 1).
Last night, I disconnected wire from negative terminal on the battery and cleaned MAF again.This morning, I reconnected battery and started the car with the MAF connector disconnected. After driving less than 500 feet, I heard what sounded like a popping noise in my exhaust. This is the first time that this has ever occurred.
I plan to replace PCV valve today with Motorcraft PCV since they are cheap ($12) from dealer to see if that works.
Anybody have any ideas? Thank you.
Gentleman's Relish
Joined: Feb 2005
Posts: 13,189
From: AZ
RE: CEL PROBLEMS
ORIGINAL: pboeschen
My 2002 GT with almost 60,000 miles on it(mods: Diablo chip and K&N air filter installed at about 30,000 miles) began to give me CEL codes on 12/3. The first three codes given were:
P1131 - Lack of HO2S11 switch - Sens Indicates Lean (Bank 1)
P1151 - Lack of HO2S-21 switch - Sens Indicates Lean (Bank 2)
P0174 - System Too Lean (Bank 2).
Only noticeable problem was RPM's decreased and engine seemed like it wanted to die when I was not moving. First attempts to correct problem included cleaning the MAF with MAF cleaner from Advance and replacing the IAC valve. I cleared the codes with my OBD-II tool.
The car ran fine for a few weeks until I noticed that the car seemed like it wanted to die again when car was not moving on 12/31. CEL came on again, with the codes now being:
P1131 (again),
P1150 - Lack of HO2S21 Switch - Fuel Trim at Limit (Bank 2)
P0171 - System Too Lean (Bank 1).
Last night, I disconnected wire from negative terminal on the battery and cleaned MAF again.This morning, I reconnected battery and started the car with the MAF connector disconnected. After driving less than 500 feet, I heard what sounded like a popping noise in my exhaust. This is the first time that this has ever occurred.
I plan to replace PCV valve today with Motorcraft PCV since they are cheap ($12) from dealer to see if that works.
Anybody have any ideas? Thank you.
My 2002 GT with almost 60,000 miles on it(mods: Diablo chip and K&N air filter installed at about 30,000 miles) began to give me CEL codes on 12/3. The first three codes given were:
P1131 - Lack of HO2S11 switch - Sens Indicates Lean (Bank 1)
P1151 - Lack of HO2S-21 switch - Sens Indicates Lean (Bank 2)
P0174 - System Too Lean (Bank 2).
Only noticeable problem was RPM's decreased and engine seemed like it wanted to die when I was not moving. First attempts to correct problem included cleaning the MAF with MAF cleaner from Advance and replacing the IAC valve. I cleared the codes with my OBD-II tool.
The car ran fine for a few weeks until I noticed that the car seemed like it wanted to die again when car was not moving on 12/31. CEL came on again, with the codes now being:
P1131 (again),
P1150 - Lack of HO2S21 Switch - Fuel Trim at Limit (Bank 2)
P0171 - System Too Lean (Bank 1).
Last night, I disconnected wire from negative terminal on the battery and cleaned MAF again.This morning, I reconnected battery and started the car with the MAF connector disconnected. After driving less than 500 feet, I heard what sounded like a popping noise in my exhaust. This is the first time that this has ever occurred.
I plan to replace PCV valve today with Motorcraft PCV since they are cheap ($12) from dealer to see if that works.
Anybody have any ideas? Thank you.
Bank 1 is passenger side, Bank 2 is Drivers Side. Since it's giving you lean codes it would be the Front O2 sensors since those control the A/F ratio.
TECH SAVANT
Joined: Dec 2006
Posts: 10,937
From: Saint Augustine, FL
RE: CEL PROBLEMS
+1 on the O2 sensors (here's how to test them once you've got 'em out) [/align][/align]The MAF has to be connected or the PCM will switch to "limp" mode and the engine will run, but like crap...[/align]
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