Question about 1999 Ford Taurus

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Vaccum hose and air cond.

Im having two problems. my check engine light is on and the code that's reading is p0171. im thinking that it's my vaccum hose and they all might need to be replaced. how many is there on a car and how much would it cost to replace them? my air con works as long as i keep the can stuff in in but the only problem is that is only lasting maybe a couple of days im guessing that i have a leak somewhere but where and how could i check this?

Posted by kesimpson on


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Put a cardboard box under your can and look for spots. vaccumlines run all through the enigne compartment going to places i've never seen on anyother car. leave it to ford to complicate things. it could also just be one of the lines is kinked or bent. go to your local auto zone and pick up a enigne scamatic. then check all your lines. good luck!

Posted on Aug 27, 2008


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Have code P0001, P0171, & P0300. Need to know

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i could only find the 2 codes for you
try here
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P0171 and p0174 codes

P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

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Found a 90deg rubber elbow on fire wall passenger side nere bottom looks like a vaccum hose line dont see anything else and engine light is on for a vaccum problem where does this line go to

sounds like the drain pipe for the air cond. Just lets the condensation drain on the ground.Supposed to be like that.Light is something else.

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Check engine light is on, error code is P0171.

Check the MAFS (sensor connected to air intake) and check the hoses under your hood to see if any are broken as this will be the cheapest to fix..

If all the hoses are good, then you should have your O2 Sensor checked as that is the most likely culprit

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P0171 code on 99 Ford Escort ZX2 2.0L

Check vacuum hoses to MAP sensor. They can get porous after a while. Also check hose to EGR valve.

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Engine check light read p0171 and p0420, noticed a leak of engine oil on cylinder 2 area of head gasket when checking the sparks plug, is that the cause?

P0171 code is described as: lean condition bank 1, oxy sensor 1. If your vehicle is a 4 cylinder, which I believe it is.. you have got a lean air/fuel mixture being found by the ecm(computer).This can be caused by several things. The first of which is a possible vacuum leak at or near the intake manifold. This can also be caused by a MAF(Mass Air Flow) sensor problem or even by something as simple as a clogged fuel filter. This lean condition could also be the cause of the P0420 :described as a catalyst efficiency problem. It would be best to have the vehicle taken to a reputable repair facility that is capable of engine performance diagnostics and have them run tests for these codes. The gasket you mention is most likely a valve cover gasket not the head gasket and would not cause these codes. Although you should have this leak fixed before it becomes a problem.

Hope this helps..

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Out 95 neon has a p0171 system too lean (bank 1)

you have a air leak, check your vaccum hoses, will take time

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Check engine on when scan code 171 comes out

On your problem with your Focus.
The code P0171 mean Fuel system to lean.
But this code is involved on a Lots of causes.
I will call a few of them, Starting with the more important.

1--- Any VACCUM LEAK. First check the PCV Valve. and hose.
2--- Air leaking On the Hose from the Throttle Body to the Air filter cleaner.
Air filter and Fuel filter Damaged.
3--- Vaccum Leak on the Intake manifold hoses.
4---- Low or High Fuel pressure.
5--- Low Fuel Octane.
6---- Bad Spark plugs and wires.
7---- MAFF sensor defective.
8--- Exhaust system Restricted.
9---- Oxigen sensor below thresshold.

ok... Remember the First is the Vaccum LEAK..

I hope this help on your problem
Thank you for use fixya....

7----- Fuel Contaminated.

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Check gngine light

Ok I think you meant code P0171, this means the fuel trim is always lean, you need to check for a engine vacum leak, maybe a cut or damaged PCV hose or any other hose that is in the vaccum system, I have read other Kia owners (Kia Forums, you should join one) reports of this same code, most found it not to be the O2 sensor but a vacuum leak.

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Check engine light.

you have a vaccum leak.check for cracked hoses

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