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I have a 1999 Nissan Frontier and can't get the engine light to stay off. I have changed the O2 sensors, checked the fuses and the computer. Any ideas of what else to check?

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  • Tim Cyprus
    Tim Cyprus Apr 23, 2017

    The testing showed the O2 sensors were bad so they were changed. Don't know the testing codes

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  • Nissan Master
  • 15,143 Answers

Have to code checked most auto stores offer this service for free and the code will assist you in fixing problem

Posted on Apr 23, 2017

Testimonial: "Already done. The codes showed to replace heater sensor and this was changed."

  • john h Apr 23, 2017

    what was code because if it is the circuit your wiring can be problem not the sensor and it could be a problem with the new sensor itself --so what was the code since none of them would state just to change a heated o2 sensor

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  • Nissan Master
  • 14,779 Answers

What code's are stored in the PCM ? Why did you change O2 sensors ?????? Have code ??????

Posted on Apr 23, 2017

  • Jeff Armer Apr 24, 2017

    No code states to replace the sensor ! Testing the electrical circuit , viewing O2 data on a scan tool ,is it fixed lean or rich , inducing a vacuum leak, adding propane to see if there is a rich or lean condition .

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  • Nissan Master
  • 2,465 Answers

Cant help you without knowing what the code is.

Posted on Apr 24, 2017

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  • Nissan Master
  • 3,225 Answers

Hello Tim Cypress,

Reading codes is great fun... but when you have a decent
understanding of internal combustion.. FIRE & FUEL
(I always used to stop by the roadside for others)

... and yet I've been TOTALLY DAZZLED
(and STRANDED) twice by BLOCKED EXHAUST.

The codes primarily were the oxygen sensors but
threw in a lot of others about fuel & EGR.

It never came together for me... I foolishly took it to the DEALER and several fully funded weeks later they had a local muffler shop replace ONE of the CATALYTIC converters...

I fixed the paint damage... and removed the tree
sap & bird droppings out of the convertible top...
(dealers seldom fail to disgust).

Check you exhaust system before total capitulation.

Carnac the Magnificent

Posted on Apr 24, 2017

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1 Answer

I have a 2002 Nissan Frontier 3.3l v6 I'm about to change my knock sensor but I also need to change the camshaft position sensor but I'm not positive of where it is located it say bank 1??????


I'm willing to bet you have weak upper O2 sensors & there's nothing wrong with your knock sensor. But if you want, the knock sensor is under the lower intake manifold in the back that is located under the upper intake manifold also called the upper plenum. The lower intake manifold is wedged between the 2 heads and is an enormous pain in the azz to get to. You can check the O2 sensors with a scanning tool that will show you the upper sensors in bank 1 & 2 bouncing electrical current from about .5v to 5v several times per second. Anything less show weak sluggish sensors. The resulting lean mixture causes a knock. Change the sensors and the knock goes away and so does the engine light after you reset it. It took me 6 months to find this problem after replacing everything else including the 6mth old O2 sensors fresh from China. Now I have Bosch. PS The lower sensors went 2 weeks later & I was told any more problems it's the fuel regulator. 2001 Frontier 3.3l v6. No problems since, it purrs like a kitten. I'd suggest the Bosch, it's a special design for that 3.3l engine.

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If one of the injectors is failing it can have a high resistance and affect the other injectors in that circuit.
The O2 sensors and cat would not affect a power loss in one or two cylinders, and the O2 sensor codes would be present.
The knock sensor only measures vibration, so it was probably ok before you replaced it.
There is a chance the cap is shorting out internally which would be tough to see, and the optic sensor in the bottom of the distributor could be causing problems too. Some of the cylinders may not be firing when you think they are.

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Check engine lights are designed to turn on because of an fuel/emission problem. You changed the O2 sensor, ****have you reset the computer by disconnected the battery for about 10-15 minutes?**** After you reconnect it drive for several miles to see if it turns on. Run the gas tank empty and when you pump gas try not to pump at gas stations that have E10 mixed with regular gas. BP and shell stations are known for that and can trip the O2 sensor. Try pumping at a gas station like the exxon. If you still have problems with the check engine light, try cleaning the mass air flow sensor ( its located after the air filter and before the throttle body). Also check the gas cap, making sure there aren't any leaks or signs of cracks in it. The best thing to do is to take it a Auto Zone or Advanced Auto and have it diagnosed for free. That could give you a better idea on what to look for if none of these things fix it

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po420 and430 is telling that the catalyst converters are no good both, most of the time bad o2 sensors maake computer think cat is no good, the way it tests is if o2 sensor reading before cat is about the same as the one after cat computer asumes cat is not bruning exhaust good , iwould replace o2 sensors reset check engine light and go from there, that might be the problem,if you were to replace cat o2s should be done at that time,so do o2s first,good luck.

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Well, you have another issue besides a knock sensor problem. A knock sensor code WILL NOT illuminate the check engine light. Check for other codes stored in the ECU. I have seen oxygen sensor issues cause knock sensor issues due to inaccurate fuel delivery resulting in engine ping at all times (causing the ECU to think that the knock sensor is bad because it's reporting ping at all times) - but also had codes for one or more O2 sensors.

Nissan Scope Technician- 10 years with Nissan

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