Someone please help me!!!!!!!!!!!!!!!!!
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New User
Joined: Jun 2010
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Someone please help me!!!!!!!!!!!!!!!!!
Any help will be appreciated, i have a 2004 ford f-150 heritage 4.6 liter v-8 and i took my truck to advanced auto parts to have it scanned, it is saying that 02 sensor is running lean what does that mean??? i changed out the two on the passeger side with new ones (bosch), cause they said it was on bank 2 side so i tried the old ones that i replaced put them on the driver side bank 1, and it is still running like crap it has a very rough idle and it will sometimes stall at a redlight it like jumps rpms between like 800 -1000 back and forth almost dying should i buy 2 more and try it ???? or do u think it could be something else and the computer is playing games ?????? thank you
Cargo Master
Joined: Aug 2002
Posts: 2,117
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From: Over Yonder, MN
The computer is telling you that the gas mixture is too lean, this can be caused by a number of things, but the most common is air leaks that allow air in behind the MAF sensor. Check for bad vacuum hoses and the PCV valve first off.
New User
Joined: Jan 2015
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Help! Ford Heritage 6
Any help will be appreciated, i have a 2004 ford f-150 heritage 4.6 liter v-8 and i took my truck to advanced auto parts to have it scanned, it is saying that 02 sensor is running lean what does that mean??? i changed out the two on the passeger side with new ones (bosch), cause they said it was on bank 2 side so i tried the old ones that i replaced put them on the driver side bank 1, and it is still running like crap it has a very rough idle and it will sometimes stall at a redlight it like jumps rpms between like 800 -1000 back and forth almost dying should i buy 2 more and try it ???? or do u think it could be something else and the computer is playing games ?????? thank you
New User
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the codes are po171,p2197,po174 the man said this was probably front and back sensors located near the converter.
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New User
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he recommended first trying to use sea foam to help clean off the carbon buildup if that does not help he said I could replace the sensors. What do you think?
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,509
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From: St James, Missouri
For any lean codes the first thing to check for is always vacuum leaks. You would be amazed how much money people have thrown at vehicles to avoid paying a shop for diagnostic services. Always check the simple stuff first before believing anyone that tell you to buy parts.
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thanks for the help on this issue. I am at a loss on checking the vacuum leaks where would I start to look? How many are there? Should just take it to a shop and ask them to check for vacuum leaks? So many shops just want to start replacing parts that I am not sure I need.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,509
Likes: 116
From: St James, Missouri
That's a great question. Without having access to the PTS website or working at a dealership I don't know where one would gain access to the Ford PCED. Perhaps digital copies are available for sale somewhere?
Fleet Mechanic
Joined: Jul 2010
Posts: 1,509
Likes: 116
From: St James, Missouri
thanks for the help on this issue. I am at a loss on checking the vacuum leaks where would I start to look? How many are there? Should just take it to a shop and ask them to check for vacuum leaks? So many shops just want to start replacing parts that I am not sure I need.
If you can't find any leaks that would be a good time to find a good diagnostic shop. Good being the key word there. I worked on a Taurus one time that the owner had at 3 different shops. They had put on a total of 6 02 sensors and a MAF sensor for a lean condition. 15 minutes monitoring fuel trims and then hooking up a smoke machine led me to his vacuum leak they never even looked for and I'm far from a genius. Those places apparently just didn't care.