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Old August 12th, 2009, 09:14 PM   #1
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1999 Lincoln Towncar, codes P0155 and P1155

P0155 - heated oxy sensor bank 02 sensor 1 circuit fault
P1151 - lack of oxy switches bank 02 sensor 1

This is my neighbors vehicle, trying to help them out. They just bought it and this started right away. There is a hesitation in the engine from 35-40 mph while in OD, very low RPMs. I can't get it to do it in any other speeds.

cleaned the MAF, didnt do a thing.

Obvious explanation would be a bad oxy sensor, but I am reading a lot of things online that say people replaced the sensor and nothing changes. I don't really want to waste their money if that isn't it ($55). I would pin in out first, but it is a PITA to get to the harness there while the vehicle is running. I found a fuse that is labeled for "oxy sensors, transmission solenoids, etc etc" and it is fine.

I'm thinking swap the oxy sensor and hope, then start tracing wires. Usually (with my experiances) when oxy sensors fail they give rcih or lean codes, which are completely different than the circuit fault this is throwing.

any help, thanks.
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Old August 12th, 2009, 09:20 PM   #2
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oxy sensors really shouldn't make a car run bad. if it has a fault it will go into default mode and run fine unless you have other issues that need to be fixed. in that case it may say its bad so you replace it and still have a problem.

in other works, if everything is working you can unplug the o2 and have no performance issues.


have you looked at the plugs?

also try unpluging the maf and see if it goes away. it could be bad and just not from being dirty, so cleaning it wont help.

Last edited by Bishop; August 12th, 2009 at 09:25 PM.
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Old August 12th, 2009, 09:26 PM   #3
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Quote:
Originally Posted by wrifrocks2005 View Post
oxy sensors really shouldn't make a car run bad. if it has a fault it will go into default mode and run fine unless you have other issues that need to be fixed. in that case it may say its bad so you replace it and still have a problem.

in other works, if everything is working you can unplug the o2 and have no performance issues.


have you looked at the plugs?
nope, I would expect a misfire code for the hesitation it is giving I think... maybe not though.

The car runs great other than the hesitation at 35-40 mph and it only happens 1 in 10 times or so.
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Old August 12th, 2009, 09:29 PM   #4
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nope, I would expect a misfire code for the hesitation it is giving I think... maybe not though.

The car runs great other than the hesitation at 35-40 mph and it only happens 1 in 10 times or so.
yeah but its a quick check. just because there is no codes doesn't mean anything.
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Old August 12th, 2009, 09:32 PM   #5
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Quote:
Originally Posted by wrifrocks2005 View Post
yeah but its a quick check. just because there is no codes doesn't mean anything.
I'll look into the plugs

also, it has what looks like a new fuel filter.
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Old August 12th, 2009, 09:46 PM   #6
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check all the vacuum lines!

mostly the pcv T and other rubber connections.

i am willing to bet this is the problem
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Old August 13th, 2009, 06:01 AM   #7
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Quote:
Originally Posted by Bones View Post
P0155 - heated oxy sensor bank 02 sensor 1 circuit fault
P1151 - lack of oxy switches bank 02 sensor 1

This is my neighbors vehicle, trying to help them out. They just bought it and this started right away. There is a hesitation in the engine from 35-40 mph while in OD, very low RPMs. I can't get it to do it in any other speeds.

cleaned the MAF, didnt do a thing.

Obvious explanation would be a bad oxy sensor, but I am reading a lot of things online that say people replaced the sensor and nothing changes. I don't really want to waste their money if that isn't it ($55). I would pin in out first, but it is a PITA to get to the harness there while the vehicle is running. I found a fuse that is labeled for "oxy sensors, transmission solenoids, etc etc" and it is fine.

I'm thinking swap the oxy sensor and hope, then start tracing wires. Usually (with my experiances) when oxy sensors fail they give rcih or lean codes, which are completely different than the circuit fault this is throwing.

any help, thanks.
1. Check fuses for the O2 sensors with a DVOM - sometimes what looks fine isn't
2. Check for 12V @ the heater pin
3. Check your kams and see which way they're off in the area the hesitation is
4. What is B1 doing, and how are the kams for that bank?
5. Also - I just thought about it - when you get the hesitation, what is lockup doing?

I'm spent.
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Old August 13th, 2009, 04:41 PM   #8
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I confirmed 12V on the 2 power wires. Then I replaced the HEGO, no change.

ugh
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Old August 13th, 2009, 11:13 PM   #9
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swap the upstream Ho2s and run the car, without clearing the codes..see if it then sets the same codes for the other bank, if not, the O2 is not the problem.

*edit* just saw you already tried the "throw money at it" procedure first
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Old August 13th, 2009, 11:16 PM   #10
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There is a hesitation in the engine from 35-40 mph while in OD, very low RPMs. I can't get it to do it in any other speeds.

I'm thinking the key lies in this statement...it may be more of a trans issue then an engine issue..check the condition of the trans oil, and watch the trans with a scanner while test driving...
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Old August 14th, 2009, 05:16 AM   #11
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Sounds like a Secondary miss to me, probably happens just after the converter locks up and you ease into throttle. If you can get Mode 6 data from your scanner you can probably ID what cyl. is missing. Is this a coil on plug car?
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Old August 14th, 2009, 07:58 AM   #12
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it is coil on plug. How hard are the plugs to change on the 4.6L? they look like the coil on plug sits directly under the fuel rail. Do I have to remove the fuel rail to change em?
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Old August 14th, 2009, 08:17 AM   #13
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it is coil on plug. How hard are the plugs to change on the 4.6L? they look like the coil on plug sits directly under the fuel rail. Do I have to remove the fuel rail to change em?
You can get the coils out without moving the rail, it's not a bad job at all. You may have a coil starting to fail though and replacing just plugs may not fix it. If the boots on the coils are really soft and expanded you can buy those separate from the coils, Auto value or napa should carry them.
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Old August 14th, 2009, 08:32 AM   #14
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the owner already gave me the green light for doing plugs, so we'll try that next.
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Old September 16th, 2009, 05:54 PM   #15
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just did plugs and fixed an exhaust leak, it doesn't look like any change.

Is there any way to test coils?
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Old September 16th, 2009, 08:53 PM   #16
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oh, and I think it has high idle
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Old September 24th, 2009, 10:14 PM   #17
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replaced the IAC, nothing new

hate this car
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Old September 24th, 2009, 10:19 PM   #18
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Still setting the same codes?
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