Trouble code P1151
#1
07-19-2021
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From: columbia, mo
Trouble code P1151
Last night my CEL came on, I pulled the code and it is P1151? Where should I start with this trouble code p1151? I still yet have to perform the compression check and cylinder leak down test., but figured dealing with the CEL is priority. Please help. Any advice or leads about the trouble code p1151 is appreciated. Thanks in advance.
#2
07-19-2021
What year Ranger?
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
The following users liked this post:
seanagins (07-19-2021)
#3
07-19-2021
Thread Starter
|
Member
Joined: Jul 2020
Posts: 104
Likes: 3
From: columbia, mo
What year Ranger?
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
#4
07-19-2021
Member
Joined: May 2021
Posts: 741
Likes: 177
From: Midwest
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seanagins (07-19-2021)
#5
07-19-2021
Thread Starter
|
Member
Joined: Jul 2020
Posts: 104
Likes: 3
From: columbia, mo
What year Ranger?
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
And what does code P1151 mean?
Do you have all the codes memorized, I don't, lol
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2(drivers side)
O2 sensors last 100k miles or 12 years, which ever comes first, how old are your O2 sensors?
When an O2 sensor gets too OLD it causes lean codes
And the lack of a Bank 1 Lean code would indicate its not a general vacuum leak because that would effect BOTH sides of a "V" engine
Could be a lower intake vacuum leak, rare but can happen
Could be exhaust manifold leak on Bank 2, sucks in air so "false" O2 lean
And yes, could be misfires on bank 2 causing it, spark, fuel or compression
Do you "feel" the engine misfiring while driving?
But if O2s have more than 100k miles OR are over 12 years old, then I would change the 2 upstream O2s just because, ITS TIME, and then see if code returns
I was told that cylinder 4 has low compression via a relative compression check or balance compression check with a scan tool. Now, I have not performed a compression check or a cylinder leak down to confirm furthermore what is occurring on bank 2...
#6
07-19-2021
1997 will be a 4.0l OHV V6 engine
Pull #4 spark plug and have a look at the tip
Pull #5 as well and compare them
I assume you "feel" a misfire?
A misfire on #4(bank 2) can certainly cause P1151 because misfires dump unburned oxygen into exhaust manifold and O2 sees that as Lean
If you do a compression test then pull out all 6 spark plugs first and then test each cylinder, write down results
Compression test is about the average compression compared to lowest cylinder, not an actual specific number
So don't use highest or lowest numbers, add up the 4 cylinders in the middle and divide that number by 4, and thats the average
If a cylinder is 10-15% lower then it can misfire
Pull #4 spark plug and have a look at the tip
Pull #5 as well and compare them
I assume you "feel" a misfire?
A misfire on #4(bank 2) can certainly cause P1151 because misfires dump unburned oxygen into exhaust manifold and O2 sees that as Lean
If you do a compression test then pull out all 6 spark plugs first and then test each cylinder, write down results
Compression test is about the average compression compared to lowest cylinder, not an actual specific number
So don't use highest or lowest numbers, add up the 4 cylinders in the middle and divide that number by 4, and thats the average
If a cylinder is 10-15% lower then it can misfire
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seanagins (07-19-2021)
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