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The maf sensor should be in airduct that goes to throttle body, three wire connector, according to diagram. It may look like picture, depending on manufacturer?
I'm not sure what kind of universal sensor you got but having been in this business for over 25 years and own a shop now I would like to make a suggestion to you. Take the universal back. Your system has a heated O2 sensor and a universal will just not do the job and you may still get DTC's (the engine light will come back on). Even if you need to go to Nissan and spend a little more money for the sensor, it will work correctly. Even though your vehicle is older, it still depends on readings from the sensors to the computer in order for it to run right. This may also help gas mileage by putting the correct one in not to mention if your vehicle runs richer or leaner you will end up doing a tune up on it sooner then normal so the extra money you spend now will pay for itself later. Your not my customer so I'm not making money off of you just trying to give you a tip. I hope you take the advice. If you do still want to put the universal on you may end up contacting the manufacturer in order to get the correct wiring for it unless someone has it on here but they would still need to know who made it.
The Heated Oxygen Sensor (1 or 2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)
Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
Causes: A code P0138 may mean that one or more of the following has happened: * Faulty O2 sensor * Short to battery voltage in O2 sensor signal circuit * High fuel pressure (not as likely)
Here are some potential solutions: * Replace O2 sensor * Repair short to battery voltage in o2 sensor signal circuit
first the quest, this is common for nissan, replace the knock sensor, this sensor is located under the intake manifold rear of engine, some models you can sneak sensor out without removing the intake, this will take care of that car. now the camry, im guessing this is a 4 cylinder engine, replace the air fuel sensor (oxygen sensor) thats on the exhaust manifold. this will solve that problem. hope this helped.
remove the 2 wire connector from the VSS, vehicle speed sensor on the top rear of the trans.
clean the VSS and the wire terminals with a terminal cleaner from radio shack.
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