Question about 1990 Nissan Maxima

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Where can I find the O2 sensor?I need to change it so I can pass smog.

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All O2 Sensors are in the exhaust pipes before the converters or in the converter and a second one, in the outlet of the converter. All you need to do, is get under the vehicle and follow the wires to the sensors.
Now, how do you know, you need a sensor?
You tested it, how?
You have a code! Doesn't mean the sensor is bad. May be, or something else is causing it to set a code!

Posted on Sep 16, 2010

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1 Answer

What is the specifications for the upstream form the CAT O2 sensor to test


The upstream Heated Oxygen sensor is said to be in good working condition if its voltage goes from low to high (100 mv - 900 mv) and vice versa in one to three times in a second.

Aug 07, 2014 | 2000 Toyota ECHO

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Check engine lite was on changed right bank 02sensor took back to be smogged still didn't pass shows the other 02sensors gave acitivity but the one i changed does not . this make 3 times i have change


Probably something in the wiring harness or the engine computer.
A mechanic would watch the data stream from the O2 sensors to troubleshoot. You should also have trouble codes for the sensor in question.

Feb 04, 2014 | 2000 Hyundai Sonata

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Not passing smog, no code or engine light


Its going to be tough to find the problem without access to a 4 gas machine. Especially if there are no trouble codes in the computer.
If the fuel mixture is rich it should set a code for one or both O2 sensors. Same thing if the EGR is not working, etc.
One thing that could cause problems is the thermostat not getting the engine up to normal temp.

Jan 29, 2013 | 2000 Toyota Tacoma PreRunner

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Will an engine bought from a 1999 Silverado originally sold outside of California pass California emissions


There are two type of emission classes.

Federal and California emissions.

Look under the hood for the emission class sticker.
Smog check station's machine in CA are programmed to handle both types.

You do not need to change anything before the inspection.

==== Side notes: You should check the service record for the last Catalytic converter,O2 sensors and EGR valve change.
Service interval for
Catalytic ~180,000 miles O2 ~150,000 miles EGR ~160,000 miles


If you can locate the last smog test (even from out of state) Check for the
CO NOx


Aug 10, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

I just bought a 93 jeep cherokee...it won't pass smog, smog test says its running to rich at idle. How can I get it to pass smog?


Could be lots of things.
It could have a leaky injector that is dripping all the time.
You can pull the injectors while still on the fuel lines, to see.
You could have bad compression and burning oil.
You need to do a compression test to tell.
You could have a bad plug or wire.
They are cheap to so just change them.
The fuel injection system could be off.
Check the temp sensor, air mass sensor, O2 sensor, with an ohmmeter.
Don't remember the values, but bad ones usually go 0 or infinite.

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I have a 2000 Daewoo Lanos with a check engine light code of P0240 can you assist me with this issue so I can pass smog


that's the o2 sensor code. it should say catalyst efficiency. you either need to replace one of your o2 sensors ($52 at autozone), or it could be your catalytic converter.

Jun 08, 2009 | 2000 Daewoo Lanos

1 Answer

Car wont pass smog.


Is it running rough? Is the check engine light on?

May 27, 2009 | 1991 Toyota Camry

1 Answer

Failed smog test due to CEL - second opinion please - not sure I believe mechanic


I have a 98 Montero Sport and have yet to fail a test. I have changed a CAT Converter for 200 and some O2 sensors for 50 per since i had the car. you can get a aftermarket universal O2 sensor at a good price as for the CAT Converter ya they are expensive I just knew the guy. As for the dash light disconect your battery it will reset it

May 23, 2009 | 1999 Mitsubishi Montero Sport

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