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I have a 2002 Mecury Villager and I am having the same problem by texansrule on Nov 10, 2009. I have replaced the oxygen sensor and knock sensor and now the inspection office said that the computer can't read the codes. Please help?

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Take it too the mecury dealer it computer to read it and a code reader just cant get to were your code is in the system . the tech1 or tech 2 computer is what i used at chevy to check the all the sensors and computers in a car or truck it gives alot of data to the tech to make sure things work right.

snap on tools make there version most shops charge a fee to put it on there computer and check it out .. call around ... ask for if they have a computer to read the codes not just obii code reader at some of the local shops near u

Posted on Oct 16, 2010


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I have a 1993 mercury villager my o2 sensor has 2 blues a white and a black and the wiring on the van has a black red and white and i need to know what way to wire them

Sounds like the wrong sensor for the car. The correct sensor would also have 3 wires: a signal wire, a ground, and a voltage, reference voltage wire. The 4 wire sensor sounds like it might be a Heated Oxygen Sensor, not applicable on your car.

Dec 29, 2013 | 2002 Mercury Villager

1 Answer

Where is the knock sensor on 2002 mercury villager

Hi Brandi,here's a link to the knock sensor.Here's what it look's like.

Mar 09, 2013 | Cars & Trucks

1 Answer

What is code 325

P0325 - Knock Sensor Circuit Malfunction
Possible causes- Faulty knock sensor
- Knock sensor circuit short to ground
- Knock sensor circuit short to power
- Knock sensor circuit open
- Faulty Engine Control Module (very unlikely).
P0139 - O2 Sensor Circuit Slow Response Bank 1 Sensor 2

Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Sep 27, 2012 | 2000 Mercury Villager

1 Answer


blessdwth3, Your knock sensor is a round unit that is about an inch and a half in diameter and is usually located on the back side of the engine block, usually near the middle. Just unscrew it to replace it and put wire back on. The speed sensor is usually located on the transmission on the long side extending to the right side of the vehicle. Take out the hold down and pull straight out, a little twisting motion will help with this. Put in new sensor and hold down bolt and replace wire. If you have a code reader then use this to clear the codes. If not, remove the negative battery wire (black wire) for about a minute and this will erase the codes.

Apr 10, 2011 | 2002 Mercury Villager

1 Answer

Mine has 217,000 miles. Has run great up until some time ago, when it started driving roughly only in wet weather. Now in dry weather, it starts fine, but drives roughly after warmed up (15-20 min) and...

The knock sensor NEVER causes a drivability problem. DO NOT change it. Instead, clean the MAF, Mass Air Flow sesnor that's on the air intake tube near air cleaner. It is coated with varnish. Spray with carb cleaner several times and gently, gently brush the wires. Theya re glass coated. Be careful.

Then disconnect battery for 2 hours and then reconnect and drive for 0 miles for computer to relearn engine contrils.

Also go here for more help

Dec 27, 2009 | 2000 Mercury Villager

1 Answer

Replace knock sensor 1997 mercury villager check engine light on

do not ever replace a knock sensor. It will not fix anything and it will cost you $600 for absloutely nothing. Repeat - do not waste your money.

go here for help

May 13, 2009 | 2002 Nissan Quest

1 Answer


never replace a knock sensor. it does not matter whether it's there or not. does not affect running of engine. $600 repair for no gain.

go here for help

Apr 04, 2009 | 2002 Mercury Villager

1 Answer


2002 PCED OBDII-Villager SECTION 1: Description and Operation Catalyst and Exhaust System Overview The catalytic converter and exhaust system work together to control the release of harmful engine exhaust emissions into the atmosphere. The engine exhaust gas consists mainly of nitrogen, carbon dioxide and water vapor. However, it also contains carbon monoxide, oxides of nitrogen, hydrogen, and various unburned hydrocarbons. Carbon monoxide, oxides of nitrogen, and hydrocarbons are major air pollutants, and emission into the atmosphere must be controlled.
The exhaust system consists of an exhaust manifold combined with a pre-catalytic converter, upstream heated oxygen sensor (HO2S11), (located just in front of the pre-catalytic converter), three way catalytic converter (TWC), downstream heated oxygen sensor (HO2S12) (located in front of the TWC), a muffler and an exhaust tailpipe.
Heated Oxygen Sensors The Villager is equipped with both upstream and downstream heated oxygen sensors (HO2S) (Figure 1). The upstream heated oxygen sensor (HO2S11) is used to control engine fuel flow. The sensor detects the concentration of oxygen in the exhaust gas and sends a signal to the powertrain control module (PCM). In a rich condition, the HO2S will output a voltage of 0.6 volts or greater, and in a lean condition a voltage of 0.4 volts or less will be output.
The downstream heated oxygen sensor (HO2S12) is used primarily for monitoring the efficiency of the catalytic converter system. The HO2S12 works in a similar way to the HO2S11 but only indicates to the PCM that the catalyst is functioning properly. In the event that the HO2S11 fails, fuel control will be switched over to the HO2S12 and the malfunction indicator lamp (MIL) will be illuminated. This allows the vehicle to operate with fewer emissions, even with a sensor failure.
Figure 1: Typical Heated Oxygen Sensor (HO2S)

Feb 21, 2009 | 2002 Mercury Villager

2 Answers

98 mecury villager knocking

rebuild engine ,or often a factory exchange unit is cheaper than a rebuild

Nov 29, 2008 | 1998 Mercury Villager

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