Question about 2002 Mercury Villager

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Where are the oxygen sensors on 2002 villager? I believe they is one before and one after catalytic converter. Is that correct.

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Correct, called upstream and downstream. look at the exhaust pipe running under you car only two electronic parts(wires) should be plugged in to it. one is right on the exhaust manifold/header(header comes out of the cylinder head) and one right after the catalytic converter. if you have any engine besides the 4 cyl such as a v6 you might have more than two. the easy way to change it is to spray it with wd-40 or equivalent penetrant, cut the wires and use a breaker bar and socket of the right size, that is assuming you everything ready to get the job done.

Posted on Nov 05, 2010

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Pontiac Grand Am 2002, check engine light is on, codes P0420, P1441, O2S11, and O2S12. I t had been driving fine, except I had noticed fuel smell occasionally when starting. Car died while driving, at...


Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter

Aug 20, 2011 | Pontiac Grand Am Cars & Trucks

2 Answers

I have an 03 Camry 4cyl LE that needs an O2 sensor. Does this model have more than one sensor? I have gotten conflicting info about the number of sensors and corresponding pns.


YOU HAVE 2 OXYGEN SENSOR UPSTREAM OXYGEN LOCATED ON THE EXHAUST MANIFOLD. THE DOWN STREAM OXYGEN SENSOR LOCATED BEHIND THE CATALYTIC CONVERTER.YOU CAR HAS ONLY 2 OXYGEN SENSORS.

Aug 05, 2011 | 2003 Toyota Camry

1 Answer

What do I need to do when this code is given? Po420 code


A P0420 is a code given by the PCM to indicate that it's detected efficiency of the catalytic converter is decreased - or that the catalytic converter isn't working correctly.

The PCM determines this by the readings it gets from the oxygen sensors before and after the catalytic converter. The code can be caused by a bad catalytic convertor or a bad heated oxygen sensor. It can also be caused by the fuel system if a malfunction there is trying to make the fuel/air ratio too extreme (lean or rich) to make the oxygen sensor attempt to work outside of their specified range.

I would recommend taking your vehicle to your local trusty auto repair facility and having them diagnose the issue and recommend a course of action. Don't be afraid to take it to multiple places to get second opinions.

May 27, 2011 | 2002 Toyota Camry

1 Answer

Onboard diagositcs indicate a dirty or faulty emisions sensor near the catalytic converter. Need a diagram to find the exact location of this sensor.


I believe it is talking about the Oxygen Sensor, which is mounted on the exhaust pipe between the exhaust manifold and catalytic converter.

Mar 10, 2010 | 2002 Dodge Dakota Club Cab

3 Answers

Were on exaust is oxygen sensor in 1999 subaru impreza auto sport


On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine
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Oxygen sensor location-Baja 2.5L DOHC engine
7aac75e.jpg


On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 1998-2001 2.2L engine
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moz-screenshot.pngOxygen sensor location-Impreza 1998-2002 2.5L SOHC engine
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I hope helped with this; remember rated this help. Good luck.

Nov 20, 2009 | 1999 Subaru Impreza

2 Answers

How to repair po420 code on a 2002 toyota sienna


The P0420 code is Catalyst System Efficiency Below Threshold (Bank 1) error.
A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers
offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Oct 26, 2009 | 2002 Toyota Sienna

1 Answer

PO420


Not just a faulty catalytic converter will trigger this code. Many other issues can trigger this code.

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Delayed spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible solutions:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter.
  • Replace Coolant Temperature Sensor
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2)
  • Replace the catalytic converter
  • Have timing adjusted


Aug 25, 2009 | 2002 Toyota Camry

1 Answer

$250 oxygen sensor parts only 2002 Jeep GC too much? needed?


YEP A BAD OXYGEN SENSOR WILL CAUSE ENGINE TO RUN RICH.CAUSING UNBURN FUEL TO GO TO THE CATALYTIC CONVERTER AND BURN IT OUT.

Aug 23, 2009 | 2002 Jeep Grand Cherokee

2 Answers

2002 Mitsubishi Galant Front Catalytic Converter


A muffler shop should be able to replace just the converter

Aug 07, 2009 | 2002 Mitsubishi Galant

1 Answer

Wiring


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

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