Question about 1998 Acura TL

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I need a wiring diagram for a 98 acura downstream oxygen sensor

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Canadian Tire Or Acura Dealership Sell Manual Book ..
But if your Lucky you can download it from Goggle Like Exemple
Download Acura TL 1998 Electrical Diagram ..Then you take the one you need ...

Posted on Oct 06, 2010

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What is an 02 sensor upstream 98 astro van


02 sensor is your oxygen sensor, 98 chevy astro carries 3 oxygen sensor. i belived your bad sensor is on the passenger side by the exhaust manifold but if not try the drivers side all the oxygen sensor for this van are the same. you need to go under the van to replace it, if is to hard to get it out turn your van for five minutes then turn it off and try again, be carefull not to burn your self. the one close to the catalytic converter is the downstream oxygen sensor ok, good luck!!!!!!

Jun 28, 2014 | 1998 Chevrolet Astro Van

1 Answer

Code p0420 acura m'dx


1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes: Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Diagnostic Help:
To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. The front reading should vary, the rear should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component concerns. See our article "Automotive Circuit Testing 101", if you need more assistance with this. Remember to refer to an model-specific repair manual for proper instruction.

Jan 20, 2014 | 2005 Acura MDX

1 Answer

I have a problem with the oxygen sensor the check engine light goes on but i changed both oxygen sensors and the check engine light still appears PO135 in 98 acura cl


Check the fuses and replace any blown fuses. This code is for the heater circuit of the O2 sensor. The heater is powered by a fuse which may have blown if the heater or the sensor wiring was somehow grounded.

Jan 20, 2013 | 1998 Acura CL

1 Answer

98 gmc sierra 1500 5.7 po430 code


Below is a general description of the problem. Check the following possibilities and we can go from there.


DTC

P0430 - Catalyst System Efficiency Below Threshold (Bank 2)

Description
Indicates Bank 2 catalyst system efficiency is below the acceptable threshold.

Possible Causes
Use of leaded fuel
Damaged Oxygen Sensors
Malfunctioning ECT
High fuel pressure
Damaged exhaust manifold
Damaged catalytic converter
Oil contamination
Cylinder misfiring
Downstream Oxygen sensor wires improperly connected
Damaged exhaust system pipe
Damaged muffler /tailpipe assembly
******** spark timing

Dec 11, 2011 | 1999 GMC Sierra

2 Answers

Where does a oxygen sensor go on a toyota celica 2000 ?


  • Locate the upstream and downstream oxygen sensors under the vehicle near the front axle. The upstream and downstream sensors resemble spark plugs with several wires connected to them. Remove the sensors by turning them clockwise with a 22-millimeter wrench.Locate the wiring harness inside the vehicle under the center console on the front passenger side. Disconnect the electrical connectors for the oxygen sensors. Feed the wires down through the vehicle and pull them out under the car.Feed the wiring assemblies on the new sensors up through the floor of the vehicle. Reconnect the wires in the wiring harness. Screw in the new oxygen sensors with your fingers. Once they are in place, tighten them with a 22-millimeter wrench.Remove the jack stands and lower the Celica to the ground. Remove the tire blocks. There should be a sensor before the CAT converter, and one RIGHT after it.


  • May 17, 2011 | 2000 Toyota Celica

    1 Answer

    I have a 98 windstar and can you tell me which one is this: HO2S-21 (Bank 2 Sensor 1) It's the oxygen sensor don't know if it's up or downstream. I know I have 4 of them no sure which one.Thanks.


    Bank 2 contains cylinders 4,5 and 6 and is the front bank of cylinders (see diagram), O2 sensor 1 is located in the exhaust pipe from bank 2 just before the catalytic converters.


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    May 03, 2011 | 1998 Ford Windstar

    2 Answers

    Need a pic or diagram of location of Bank 2 sensor location on a 2004 Acura TL 3.2


    Oxygen Sensor-I don't have a location of the Bank 2 sensor, so you'll have to guess on it by determining how many sensors you have by inspecting the exhaust system from the exhaust manifold down to the catalytic converter and past the catalytic converter which is downstream. Anything before the catalytic converter is upstream.
    Do you have a code that describes which O2 sensor is not responding correctly?

    Test/Replace
    • The sensor is threaded into the exhaust manifold.
    • It can be difficult to remove unless a special anti-seize compound is coated onto its threads.
    • Torque the sensor to 30 foot-pounds using a special socket.
    • A sensor that is too loose or a cracked exhaust manifold can result in a lean signal to the computer.
    • Check the vents in the thimble of a replacement O2 sensor.
    • There should be the same number of holes and they should face clockwise or counterclockwise like the ones on the original sensor.
    • Installing the wrong sensor can result in slower cross counts.

    ---
    Operation
    Although the oxygen sensor is termed a sensor, in actuality it is a galvanic battery. The oxygen sensor compares the potential difference between the ambient oxygen content around the exhaust and the oxygen content present in the exhaust stream. When the exhaust sample is lean, there is more oxygen in the exhaust as compared to the atmosphere. When the exhaust sample is rich, there is less oxygen content in the exhaust as compared to the atmosphere. The greater the difference between ambient oxygen and exhaust oxygen content, the greater the voltage produced.
    For the oxygen sensor(s) to operate properly, it has to reach an operating temperature of approximately 600°F before a consistent voltage potential can be generated.
    The Engine Management System (EMS) determines the state of readiness of the oxygen sensors by supplying a bias voltage of approximately 400 - 500mVDC to the oxygen sensor. As the sensor begins to warm up, the voltage produced increases due to rich exhaust mixtures commanded by the EMS. When the EMS senses a return voltage greater than the bias voltage, the computer will command the fuel mixture lean. When the output voltage from the sensor drops below bias voltage levels, the computer will command a rich mixture again. When the EMS determines that the O2 sensor has responded properly and within a predetermined amount of time, it will begin using the sensor as an input to adjust fuel trim.
    Many Oxygen sensors used in OBD 2 engine management systems incorporate heaters. These heaters raise the sensors up to operating temperature quickly. The sooner the oxygen sensor gets to operating temperature, the sooner the EMS can maintain closer control over emissions, economy and performance. The oxygen sensor provides the computer with necessary information to maintain favorable operating conditions for the catalytic converter. The role of the catalytic converter is to store oxygen for the reduction of HC, CO and NOx emissions. The oxygen sensor input is used by the EMS to protect the catalytic converter by cycling the air/fuel mixture rich and lean. This provides adequate oxygen for storage while maintaining cool enough operating temperatures to prevent catalyst damage.
    In addition to controlling the converters operating conditions for emissions control, the computer uses the oxygen sensors to tailor fuel trim providing a balance between fuel economy and performance.
    Abnormal sensor activity has a profound effect on pulse-width and fuel trim strategies. Sensor values that indicate lean conditions will cause the computer to command changes in short term fuel strategies. Conditions such as secondary misfires create excessive HC levels. This also produces high oxygen levels in the exhaust. The oxygen sensor will sense only the increased oxygen content and input to the computer will be below bias voltage levels. The computer will respond by commanding additional fuel.
    OBD 2 vehicles use oxygen sensors downstream of the converter(s) to monitor the efficiency of the catalyst. When the catalyst performs properly, available oxygen is used resulting in low levels oxygen in the exhaust sample. While downstream oxygen sensors are constructed the same as upstream oxygen sensors, the values that they generate are different. With relatively richer mixtures present around the downstream oxygen sensor, voltage inputs to the computer will be above the 450mV bias voltage. If the catalyst is operating effectively, the downstream oxygen sensor will cycle when the catalyst is flooded with oxygen. Typical values from the downstream oxygen sensor(s) are between 550- 900mV at idle.
    While the downstream oxygen sensor is used to monitor catalyst efficiency, the upstream sensor has a pronounced effect on performance. Lean oxygen sensor values will result in an increase in pulse-width, excessive emissions, surging, hesitation, and potentially catalyst damage. Additional fuel can cause the catalyst temperatures to rise due to an afterburner effect in the converter. The oxygen sensor is the only post combustion input to the EMS. Other malfunctioning systems affect its operation.
    Improper rich indications will cause lean operating conditions that may result in loss of power, hesitation, surging, poor idle quality and possibly converter damage. Sensors that do not switch properly, or are lazy do not provide accurate information to allow the computer to properly maintain the air/fuel mixture. Faulty heaters do not allow the sensors to reach operating temperature fast enough and the vehicle may remain in open loop for longer periods of time. Malfunctioning heaters also allow the sensors to cool down during periods of extended idle.
    A faulty oxygen sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
    Related Symptoms
    • Surging at idle
    • Unstable idle
    • Running rough off idle
    • Hesitation
    • Stumble
    • Chuggle
    • Poor fuel economy
    • Spark knock
    • Stalling on acceleration
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    Oct 15, 2010 | 2004 Acura TL

    1 Answer

    Getting OBD codes p0420 and p0430, how to fix these issue with my 2001 Audi A6


    2001 Audi A6
    EOBD code: P0420
    Fault location: Catalytic converter system, bank 1 - efficiency below threshold
    Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

    EOBD code: P0430
    Fault location: Catalytic converter system, bank 2 - efficiency below threshold
    Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

    Sep 14, 2010 | 2001 Audi A6

    1 Answer

    Replace oxygen sensors


    these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

    May 15, 2009 | 1998 Plymouth Grand Voyager

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