Question about Mercury Mystique

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Po171 What does p o 171 code mean, engine light keeps coming on or a 1996 mercury mystique

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Type: OBD PO171

into Google

Posted on Mar 19, 2014

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: mercury mystique 1996 water pump

the temp in my car goes up when I'm not driving. idling. Do u think its the water pump?

Posted on Apr 05, 2009

chuck943
  • 783 Answers

SOURCE: Does PO0430 mean anything other than replace the catalytic conver

Yes the front O2 sensor(the one before the cat) could be lazy and cause this also.

Posted on May 25, 2009

  • 279 Answers

SOURCE: brake lights for a 1996 Mercury Mystique

The "multifunction switch" is bad. In the old days, this was called the turn signal switch. The brake light wiring for the two non functioning lights goes through this switch. Have your mechanic check the wiring into and out of this switch. It's in the steering column.
Charlie

Posted on Jun 16, 2009

emissionwiz
  • 75117 Answers

SOURCE: 1999 mercury mystique check engine light

Why my Check Engine light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.

Posted on Oct 06, 2009

  • 14 Answers

SOURCE: Check Engine Light Code 332

332 = EGR valve opening not detected.

You should be able to find a list of DTC's on the Internets somewhere.

Posted on Jan 04, 2010

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Good luck (remember rated this help).

Jan 12, 2010 | 1996 Mercury Mystique

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Brake lights for a 1996 Mercury Mystique


The "multifunction switch" is bad. In the old days, this was called the turn signal switch. The brake light wiring for the two non functioning lights goes through this switch. Have your mechanic check the wiring into and out of this switch. It's in the steering column.
Charlie

Jun 16, 2009 | 1996 Mercury Mystique

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Thermostat?


sounds like the head gasket is no good.pressure is getting into the coolant and overpressurising the resevoir.
if coolant is in the oil,low oil pressure triggered the oil light and check engine trigger results from lost compression.
a compression test will tell you.take a look at the coolant,is there oil in it?

Apr 23, 2009 | 1996 Mercury Mystique

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Dec 15, 2008 | 1996 Mercury Mystique

1 Answer

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Check for vacuum leaks.You can spray starting fluid around all parts of the intake.Observe idle as you do.If there is a leak the engine rpm will race higher.Also listen for hissing noise.Is the check engine light on?..If so what codes are stored..Good Luck!!!

Aug 04, 2008 | 1996 Mercury Mystique

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