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How many sensors are found on the exhaust manifold?

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One
it is a heated oxygen sensor (HO2S)

Posted on May 10, 2017

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Where does the upstream passenger side 02 sensor bolt in on the exhaust i found the sensor hanging from the electrical connector busted out the engine its a 1994 ford thunderbird


It should be screwed directly into the exhaust manifold. If you found it hanging, and you do not have a major exhaust leak, then I would say that your O2 sensor is broken. Look for a bung on the manifold and you will have to extract what is left of your old one.

Jun 11, 2015 | 1994 Ford Thunderbird

1 Answer

I need diagram of 93 Nissan d21 o2 sensor location


It's the only sensor or part in the exhaust that has a wire to it. It is often found right on the exhaust manifold, or in the exhaust pipe just beyond the exhaust manifold. It is threaded into the exhaust, and was installed with anti-seize compound on the threads, making it easy to take out.

Some vehicles have this oxygen sensor for fine tuning the fuel metering, and a second O2 sensor in the exhaust after the catalytic converter, there solely for monitoring the efficiency of the converter.

Apr 27, 2014 | Cars & Trucks

1 Answer

Where are the four O2 sensors on a 2003 Montero Sport? Is $300 reasonable to replace the two upstream sensors?


According to the service literature I read, the 2003 Montero Sport with the 3.0 or 3.5 L engine does not have O2 sensors listed even in the maintenance schedule. The 2.4 L engine has it on the exhaust manifold though.
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However, the following lists the par, though for before or after the catalytic converter:

http://www.partstrain.com/store/index.php?VN=4294967180+4294966587+4294964143+&Nr=AND(universal:0)&N=0&Ntt=Oxygen%20Sensor

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I think that $250 to $300 is reasonable if the Oxygen sensors are stuck in there with rust and the threads are preserved by the technician. Oxygen Sensor replacement can be tricky.
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Good luck on this repair.

Exhaust Manifold

REMOVAL & INSTALLATION

2.4L Engine


  1. Remove or disconnect the following:

    • Negative battery cable

    CAUTION
    Wait at least 90 seconds after the negative
    battery cable is disconnected to prevent possible deployment of the air bag.


  2. Heat cowl from the exhaust manifold
  3. Aspirator valve assembly, if equipped
  4. Oil dipstick and guide
  5. Oxygen (O2S) sensor connector and ground cable, if equipped
  6. Exhaust pipe from the manifold
  7. Exhaust manifold and gasket from the engine
    To install:

  8. Install or connect the following:

    • Exhaust manifold. Torque the M8 mounting nuts to 22 ft. lbs. (29 Nm) and the
      M10 mounting bolts 36 ft. lbs. (49 Nm). starting from the middle and working
      outward.
    • O2S sensor connector and ground cable, if equipped
    • Exhaust pipe to the manifold. Torque the nuts to 35ft. (49 Nm).
    • Aspirator valve assembly, if removed
    • Heat cowl to the exhaust manifold. Torque the bolts to 117 inch lbs. (13
      Nm).
    • Negative battery cable

  9. Start the engine and check for exhaust leaks.


3.0L and 3.5L Engines


  1. Remove or disconnect the following:

    • Negative battery cable
    • Exhaust pipe from the exhaust manifolds
    • Oil dipstick, guide and O-ring
    • Heat shields
    • Exhaust manifolds

  2. Clean the gasket mounting surfaces. Inspect the manifolds for cracks,
    flatness and/or damage.
    To install:

  3. Install or connect the following:

    • New gasket and exhaust manifold. Torque the nuts to 33 ft. lbs. (44 Nm) on
      3.0L engines and 22 ft. lbs. (29 Nm) on 3.5L engines.
    • Heat shield, Torque the bolts to 10 ft. lbs. (14 Nm).
    • Exhaust pipe to the exhaust manifolds. Torque the nuts to 35ft. (49 Nm).
    • Oil dipstick, guide and new O-ring
    • Negative battery cable

  4. Start the engine and check for exhaust leaks.


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Oct 07, 2010 | 2003 Mitsubishi Montero Sport

1 Answer

Where are the exhaust system bolts located?


Removal & Installation 2.2L Engine To Remove:
  1. Remove or disconnect the following:
    • Negative battery cable.
    • Heat shield.
    • Oxygen sensor.
  2. Raise and safely support the vehicle.
  3. Remove exhaust pipe from the exhaust manifold.
  4. Lower the vehicle.
  5. Remove the exhaust manifold mounting nuts from the cylinder head. chevy_cav_02-04_exmanifold.gif

  6. Remove the exhaust manifold.
  7. Clean the mating surfaces.
  8. Check for cracks, broken flanges and gasket surface damage.
  9. Use a straight edge and a feeler gauge. If the flanges or the mating surfaces do not align, the manifold is warped and should be replaced.
To Install:
NOTE: The manufacturer recommends using new exhaust system nuts.
  1. Install the manifold gasket.
  2. Position the exhaust manifold to the cylinder head. Exhaust manifold 2.2L 87953055.gif

  3. Install the new exhaust manifold nuts. Tighten the nuts starting from the center and working toward the ends to 110 in lbs (12.5 Nm).
  4. Raise and safely support the vehicle.
  5. Install the exhaust pipe to the manifold using a new flex coupler gasket.
  6. Install new exhaust flange mounting nuts.
    • Tighten to 33 ft lbs (45 Nm).
  7. Lower the vehicle.
  8. Install the oxygen sensor.
  9. Install the heat shield.
  10. Connect the negative battery cable.
2.4L Engine To Remove:
  1. Disconnect the negative battery cable
  2. Disconnect the Oxygen (O2) sensor electrical connector.
  3. Remove the (O2) sensor.
  4. Raise and safely support the vehicle. Exhaust brace 2.4L 87953053.gif

  5. Remove the exhaust manifold brace-to-manifold bolt and the oil pan nuts, if necessary. Exhaust heat shield 2.4L 87953051.gif

  6. Remove the upper heat shield. NOTE: Do NOT bend the exhaust flex decoupler more than necessary to remove it. Excessive movement will damage the flex decoupler
    Exhaust flex decoupler 87953056.gif

  7. Remove the manifold-to-exhaust flex decoupler fasteners.
  8. Remove the exhaust pipe.
  9. Carefully lower the vehicle.
  10. Remove the exhaust manifold-to-cylinder head mounting nuts/bolts. Remove the exhaust manifold.
  11. Discard the gaskets and/or seals. Clean the mating surfaces.
To Install:
Exhaust manifold 2.4L 87953055.gif

  1. Install new exhaust manifold gaskets. Position the exhaust manifold on the cylinder head. Tighten the mounting bolts in sequence to 110 in lbs (12.5 Nm).
  2. Raise and safely support the vehicle.
  3. Install the exhaust manifold heat shield. Tighten the mounting bolts to 10 ft. lbs (14 Nm).
  4. Install the exhaust manifold brace-to-manifold bolt and the oil pan nuts. Tighten the mounting bolts to 41 ft lbs (56 Nm) and the nuts to 18 ft lbs (24 Nm).
  5. Position the exhaust pipe to the manifold. Install the manifold-to-flex decoupler mounting bolts. Tighten to 26 ft lbs (35 Nm).
  6. Lower the vehicle.
  7. Coat the threads with a suitable anti-seize compound and install the O2 sensor.
  8. Connect the O2 sensor electrical connector.
  9. Connect the battery ground cable and check for leaks.
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Sep 02, 2010 | 2000 Oldsmobile Alero

2 Answers

Were is the 02 heater censor found on a 2003 chev. p.u a code comes up po135 ive replaced the ones on tye exhust


You will have 1 on each exhaust manifold coming from the engine and 1 on each exhaust pipe near the catalytic's which these are the ones you say you replaced. So the others will be on the manifold.. This po135 should tell you if it's (bank 1) or Bank 2. Call you local auto zone and they should be able to tell you which it is.

Aug 14, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

I have a 2003 Ford Escape with a PO420 error code. When I accelerate, it sounds like air is coming from my engine. What is the problem and what should I do?


Here's what the code means, P0420 -- Catalyst System Efficiency Below Threshold (Bank 1).
Causes: Bad O2 senor, bad catalytic converter, and/or leaking exhaust manifold.


The error is coming from the O2 sensor number 1 between the exhaust manifold and the catalytic converter. The sensor itself may not be the problem. From what your describing is maybe a leak coming somewhere near the exhaust manifold. This would set off the P0420 code. Look around the exhaust manifold down to the catalytic converter for leaks that will leave black marks from burned fuel. If this can't be easily found, you may have to take the car in and have the exhaust hooked up to a smoke machine. This will inject smoke into the tail pipe and any leaks will be found by the smoke coming out of it.

Nov 16, 2009 | 2003 Ford Escape

1 Answer

Where is the port 2 02 cencer


The vast majority of vehicles made post 1990 have more than 1 O2 sensor. These sensors look much like spark plugs with a set of wires coming out of the back. The one you are most likely looking for is the last O2 sensor before the exhaust exits the vehicle.

This sensor can be found underneath the vehicle at the catalytic converter. The easiest way to find the sensor is to crawl underneath your vehicle and follow the exhaust pipe from the rear bumper up to about the middle of your car, roughly the front driver/passenger floorboard. When the exhaust pipe seems to be bolted to another section of pipe, much wider than the exhaust pipe and anywhere from 1 to 2 feet long. This is the catalytic converter.

The O2 sensor you are looking for should be on this unit near the front, sitting on an angle on the top, passenger side. It will have a set of wires coming out of the back of it and proceeding up into the passenger floorboard.

If this is not the correct sensor that you are looking for, more than likely you want the one that is attached to the beginning of the exhaust manifold in the engine bay. Open the hood and look down, you should see a solid metal heat shield protecting the exhaust manifold. Somewhere on the manifold will be another O2 sensor.

Aug 06, 2009 | 1997 Ford Taurus

2 Answers

There are 2 oxygen sensors on the 1995 Volvo 850 GLT. Where are they located?


under the intake manifold...which must be removed to get to them

Jun 05, 2009 | 1995 Volvo 850

1 Answer

O2 sensor location


It should be screwed into the exhaust manifold - it will kook like a spark plug with one wire on it.

May 24, 2009 | 1998 Oldsmobile Bravada

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