Question about 2002 Nissan Sentra

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Service engine soon light is on. had a o2 code. replaced sensor and light went off for 1 day. light back on same sensor. any thoughts?

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Its could be a loose of harness or connectors. check continuity between o2 sensor and ecm.

Posted on Jul 13, 2010

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Same Q's for 2001 Mitsubishi Eclipse GT..


Start buy replaceing the o2 sensor after the cat first o2 sensor if bad will give wrong reading i normaly tell the person lets try replaceing 2 o2 before spending 900 on a cat

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What are codes P0133 & P1134, for a 2005 Buick Lacrosse 3.8L V6 with 94,000 miles.


i have replaced an O2 sensor and had similar failure after 1500 miles.
I removed it, chkd it, reinstalled it and it ran fine.
P0133 is related to slow response of O2 sensor. P1134 is mfg specific so google that for ur car.

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Engine Service Soon Light On code P0154


Error Code: P0154
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Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
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My SERVICE ENGINE SOON light came onAGAIN!


Disconnecting the battery should reset it but I would bet that the light will come back on. I would have a auto parts store read the error code for you. They can also reset it. There are two o2 sensors on this car one on the manifold and one down stream from the converter. If you are getting an o2 error code it could also be the converter.

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P0138 and p0158


These codes, po 138 bank 1 sensor 2 shorted to voltage and code po158 means bank 2 sensor two shorted to voltage. these are the two rear oxygen sensors in the exhaust system. there two up frt and two in the rear, check the wiring on the two rear sensors, make sure that the wiring is not cut or stuck between metal. if the wiring is good then replace both rear sensors, when you get them ask for the left and right after the cat sensors. or bk1 s2 and bk2s2. after replacing them reset the computer. go to an auto parts sotre or if you have a code reader you can do it. hope this helps good day.

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My Service Engine Soon light came on about a year ago. I took it into the shop and got that problem fixed but the light stayed on, so I took it to advance auto parts and code tested it and it said that...


There are several types of O2 Sensor codes. There can be "Lean O2 Sensor" codes, "Rich O2 Sensor" codes, "O2 Sensor Slow Response" codes, or "O2sensor Heater Circuit" codes. The specific code that is being set changes the way you must go about diagnosing and repairing the problem. I will say however, that in about 80% of all the O2 Sensor code problems that I have had to diagnose, the O2 Sensor itself was NOT the problem. The O2 Sensor was only reporting a problem that was actually caused elsewhere. O2 Sensors are the final checkpoint in the engine management system. I think of them like a report card. If the O2 Sensors are right, the rest of the engine management system is right. If the O2 Sensors are not right, the rest of the engine management system is probably not right. (Except in the 20% of the cases where the problem is actually being caused by a failed O2 Sensor)

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Have 1996 chevy Silverado 4.3 Service Engine Soon Light Stays on took to Autozone & the reader said replace O2 Sensor


A P0147 is caused by a failure in the O2 sensor heater circuit. The heater circuit is used to allow a more accurate reading (for O2 sensor) while system is below normal operating temperature. The only way to properly fix this problem is to replace the O2 sensor, however you can clear the code and it may be a few days before it comes back [and sets check engine light]. This condition is somewhat common on GM vehicles of that age.

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2002 ford expedition "service engine soon" light keeps coming on. I've had the O2 sensor replaced three times in the past month, now the next day or two after the sensor replacement the light comes back...


get a new mechanic, need to check for vac. leaks, poss needs tune up. alot O2 codes i have gotten have been created by vacuum leak or warn out plugs, rarely have i had to replace a O2 sensor.

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1 Answer

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It NEVER was the camshaft sensor! Unless, you've removed the engine lately, which I doubt.
RUN to Advance Auto Parts and buy a can of "SeaFoam" and add to your gas tank per instructions...drive at least 100 miles and the problem should go away...IF it doesn't you'll have to replace the O2 sensors in the exhaust system...Any good mechanic should be able to do this for much less $$ than the dealership DO NOT go to the dealer for repairs!
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