Question about 1998 Kia Sephia

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Can I get a diagram of replacing the downstream o2 sensor

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Hello adam...i suspect you are getting the P0140 O2 sensor circuit no activity (Bank 1 Sensor 2) fault code on your Kia?
The "downstream" O2 sensor will be BEHIND the catalyst converter and is tuned into the PCM map. Simply remove and replace. Typically this code is set due to a clogged or failed sensor, a poor connection, or an open circuit.
The P0420 code is typically a clogged or defective cat.
Good luck..i hope this helps..please rate me a fixya.

Posted on Jul 24, 2009

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Posted on Jan 02, 2017

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autodr
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SOURCE: 2005 Subaru Legacy: Where are the O2 sensors located (both)

the o2 sensors are locted in the exhaust system. upstream is before cat converter, downstream is after cat converter.

Posted on Nov 22, 2008

  • 512 Answers

SOURCE: Po136- bank 1 sensor 2

this code is for the 02 sensor heater...there is a relay that sends the voltage to the sensor that may have malfunctioned or there may be no voltage to it

Posted on Jan 26, 2009

emissionwiz
  • 76630 Answers

SOURCE: Does my 1999 Mercury Mystique have 4 O2 Sensors or am I wrong?

the sensors before the catalytic converters are the upstream sensors, the ones after the after the catalytic converters are the down stream sensors, Ford calls them the Catalyst efficiency monitors.

Posted on Apr 26, 2009

daves944
  • 1050 Answers

SOURCE: 02 sensors not ready

The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.

I've posted the drive cycle just so you know what to do when you have resolved the code.

  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
    Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Posted on May 14, 2009

  • 318 Answers

SOURCE: P0420 and P0430

The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.

Posted on Sep 25, 2009

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1 Answer

Can someone give a diagram location of up and downstream 02 sensors on 2003 ford expedition?


The upstream O2 sensors are just off the engine exhaust manifolds, the downstream sensor is located aft of the catalytic converter, it is not called an O2 sensor it is referred to as the catalyst efficiency monitor.

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Year--make--model would be helpful?
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O2 sensor wiring diagram 2005 ford expedition


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Where is downstream left o2 sensor located in 2005 kia sportage?


For oxygen sensor location diagram on kia sportage, click the link below:---

http://technoanswers.blogspot.com/2012/12/o2-sensor-located-in-2005-kia-sportage.html


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These will help.
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Diagram of the location of a down stream o2 sensor on a 2005 chevy malibu.


Hi,
Downstream sensor is screwed into exhaust pipe after the catalytic converter on most models. Depending on your exhaust configuration, your code will say bank 1 or bank 2 or no bank designation. Some have converters coming off each cylinder bank (exhaust manifold off cylinder head) if only 1 converter in system (no bank) there will only be the one O2 sensor downstream.
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03 santa fe code p0421 for warm up catalyst below bank 1is it converter sensors whats bank 1 converter location compared to bank 2 is there 2 banks or converters would it be upstream or downstream if it...


If the engine is a V6 (2.7 or 3.5 lit), bank 1 is next to the firewall (right hand) when facing the back of the engine.
If the engine is a 4 cly (I4), there is only one bank and is designated Bank 1 (exhaust manifold).

The catalyst to which the code refers is the UPSTREAM, and there is only ONE upstream cat for any bank.

Clue: Two upstream O2 sensor and two downstream O2 sensors - one before the CAT and one after the CAT. the downstream O2 sensors are identical to their upstream sisters. The only reason for the DOWNstream sensor is to monitor the CAT efficiency (threshold).

The catalyst on either bank is essentially the exhaust manifold which houses the CAT... it is the only CAT to which the code P0421 applies.

Hope that helped

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2 Answers

Exact location of downstream O2 sensor.


Downstream O2 sensor is after (downstream) the catalitic converter on the exhaust pipe. Upstream O2 sensor is after (downstream) the engine exhaust manifold - before (upstream) the catalitic converter. Upstream O2 sensor controls air-to-fuel ratio to yield a small excess oxygen. Downstream O2 sensor assesses the catalitic converter performance.

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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

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