Question about 1997 Suzuki X-90

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O2 sesnor I need to replace the lower rail O2 sensor on a Suzuki X90,1997 and I want to order it on line but am not sure which one it is I think this is the one that is after the Catalytic converter and is the four wire one. The upper one has been replaced and they say that the lower one is working but is lazy.

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  • mwilczak Dec 11, 2008

    I don't have a code I assume you are refering to the computer read out. All I know is there are two O2 sensors on the X90 which they call the upper and lower sensors. I think the lower one is the 4 wire and the upper is the one wire sensor I just need to know which one to purchase to replace what they call the lower rail O2 Sensor.

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The one after the cat is not an O2 sensor, I know it looks the same but it's function is to measure the efficiency of the cat converter at cleaning the pollutants out of the exhaust, what code do u have and I will try and help u.

Posted on Dec 11, 2008

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What does error codes 40 and 41 mean on my 1999 mitsubishi eclispe mean


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15 Idle speed control (ISC) motor position sensor fault.
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2000 Ford E150 4.2 obd2 codes 1132 an 1152


Disconnect the fuel return line at the fuel rail and monitor your fuel pressure when the ignition switch is cycled to the run position several times WITHOUT starting the engine. Connect a hose to the rail to allow fuel to drain and not spray all over the back of the engine. If your fuel pressure is high (60psi or higher) it will show that you have a defective fuel pressure regulator , or debris in the fuel rail causing a blockage of fuel flow. If the pressure is normal with the return line disconnected it suggests the fuel return line is plugged up between the engine and tank or in the tank. Your issue is that you are Running extremely rich, hence your O2 reading .

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sounds like an o2 sensor on the drivers side theres and upper and lower o2 sesnor they go for about 100 bucks on parts geek.

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Bank 1 Sesnor 3

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Engine wont stay on when started unless you step on the gas,service engine soon " light comes on.Scanned it and you get code po172 system too rich.


Okay, lets start with you checking the fuel preasure regulator, this is a common problem with these the regulator leaks and the vac line connected to it starts sucking gas into the intake, this causing it to run rich and depending on how bad the leak is it will stall engine at idle, remove the vacuum hose from regulator and start engine then see if gas shoots out the vac connection on the regulator, if it does then replace regulator, hope this helps.583ec1c.jpg

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Im trring to find the location of the o2 sensor it needs to be replaced but having trouble figuring out which one it is.


The upper O2 sensor is located on the exhaust manifold/s, and the rest is down the line. Some Vehicles have 2, 3, etc. The Upper O2 reads and helps control air/fuel mixture, the lowers usually monitor emissions, and Catalytic converter efficiency.

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One of three (3) possibitlies:
1. Catalytic Converter is malfunctioning.
2. O2 Sensor is malfunctioning. This will be the O2 Sensor located on the Catalytic Converter. However you should check and/or replace both sensors if needed.
3. You have an Exhaust Leak.
In Order of checking:
A. Check and Repair any Exhaust Leak.
B. Replace the O2 Sensor on the Catalytic Converter 1st. Also Known as the Downstream O2 Sensor or HO2 Sensor.
C. Replace the O2 on the Exhaust Manifold prior to the Catalytic Converter. Also Known as the Upstream O2 Sensor.
D. Replace the Catalytic Converter.
Let me know if this helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!

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1 Answer

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Might have to lower exhaust pipe, depending on which O2 sensor you are replacing, upstream or downstream. There are sensor sockets available or a metric wrench. Also available is a crow foot wrench that can be used with a ratchet.

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The solution is that when the oil filter is removed, oil gets on the O2 sensor and ruins it. Must cover the O2 and that keeps the oil off. To keep the check engine light off, is to replaced the O2 sensor. Problem solve. Later on sx4's they move the O2 in a different spot. I work on Suzuki cars. Don

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Where are they!


what kind of car? irregardless, you can pick up a detailed chiltons or haynes repair manual for your model at a local auto parts store.

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