2000 Nissan quest van the check engine light blinks on and off while driving

I have a 2000 Nissan quest van the check engine light blinks on and off while driving what could be the problem

It may need servicing and is letting you know that it is nearing a pre programmed service interval. It may be that an issue is in the process of developing and is giving you notice of it. I would consult a good independent to have them check it out before anything serious develops

check engine light p0325 knock sensor bank 1 or sensor closed loop bank 1 p0135 o2 sensor i bought the car with check engine light on i 've changed on of the o2 sensor and i did tun up on it but still the light still the code in the scanner reading the code in the top 

The PO325 knock sensor code is common on many Nissans, it doesn't bring on the Service Engine Soon if is performance related, it will bring on the light if the sensor goes open circuit.. These engines just always seem to have that code when you are presented with another trouble code, so go after the Oxygen Sensor related code first. The code P0135 is for the heater circuit control in the front O2 Sensor. If you still have the old O2 sensor check the electrical connector on the old sensor two of the wires should have continuity to each other (this is the heater circuit, if none of the wires at the connector have continuity the sensor is in fact defective but they sometimes go "open only when hot operating conditions). The electrical harness itself gives problems and failure occurs bringing on the Service Engine Soon light. Ignition key on you should have power (12V) at the disconnected O2 sensor harness. The computer grounds the sensor heater circuit as required. The problem may have to be fixed by "ohming" out the harness wires until the fault is found. I suspect by fixing the P0135 problem your service light will stay out once reset. The knock sensor is labor intensive to replace.

most check engine lights come on and stay on but, yours may have a warning flicker first--USUALLY it is just a pain the butt light that makes you bring it to the dealer,,,they are set at mileage intervals and when dealership or whomever replaces oil they RESET IT,,,but--if you want to try resetting it yourself (wont hurt anything-if it is something real will come on again after resetting it) Here is what you do... turn car off,,,press and hold TRIP reset if you have one and turn car to the position JUST BEFORE the start position and keep holding... you should see lights come on and then one by one go off OR your trip will have a series of dashes that decrease till there is none left... thats it ! if this does work and it is something wrong it will come back on,,,,in which case bring it to autozone or autostore and they will hook up the diagnostic and tell you for free what is bothering your car.

There are literally about 150 reasons why the check engine light could come on. Did the mechanic read the codes? It sounds like he is guessing at reasons. A blinking check engine light is the "second level" of check engine lights. If the light comes on, there is a problem, but if it blinks, there is a problem that immediately needs to be addressed or you risk damaging the catalytic convertor or other components. A leaky intake gasket is possible but I would consider other options first, like a throttle position sensor or 02 sensor.

Understanding Service Engine Light Issues?

What is a Service Engine Light? 

 What exactly  has to be serviced?

Complete Engine or some particular part?



A: You know, that’s a great question! Because the only other backward phrase next to the "Service Engine Soon" is "Check Engine". What person with any sense would use such a phrase? The Check Engine warning light comes on in a bright yellow. So you stop your vehicle and open the hood. Surprise! The engine is still there. No it didn’t fall out while you were driving. It looks no different than that last time you saw it. So, what’s the point of that darn warning light? Okay, now the Service Engine Soon light. Just what the heck does that mean? What’z, the oil low? No, it must be the coolant! I know of people that had their oil changed 2 to 3 times in an effort to turn the Service Engine Soon light off. It wasn’t that these people were on the short end of a stick. Though it would have been helpful to read the foreign language manual that comes with the vehicle. They were just following the seemly simple instruction displayed in bright warning yellow.

As per Our Professional Garage Repair  theory. Computers in vehicles came about the same time the politically correct junk did. After all we wouldn't want to offend people with accurate information and the truth now, would we? You see once the politically correct flip’os had infiltrated the auto industry they quickly went to work. They construed a plan to introduce warning lights that just confuse the issue, AKA politically correct warning lights! Translation? No body has a clue what it means.

The Service Engine Soon warning light is just the politically correct way to alert you that the computer in your vehicle has a system problem. Visit your favorite automotive service facility for a diagnostic consultation with your vehicle’s computer.

How To Turn OFF "check engine light"

Check engine light reset

Q: Please Tell  how to turn off my "Check Engine" light? For 1997 Jeep Grand Cherokee Laredo, 4.0 L. An auto parts store guy read the code for me, and said he thought it would turn off after about 15 or so "drive cycles". Any truth to that?



A: The “Check Engine” will turn off by itself if the problem is no longer present after about 3 drive cycles. Each time your vehicle is started and driven the computer’s software commands a wide variety of tests to be performed and monitors various sensors while the vehicle is being driven. A drive cycle is when the vehicle/engine sets long enough for the coolant to drop below a specified temperature. Then the engine is started and the vehicle is driven at different speeds and allowed to reach full operating temperature. The reason for this? The computer not only tests the system, it also monitors for range of operation. Certain tests can only be performed when the engine is cold while others are performed when the engine is hot. Each time the engine is started the computer performs over a hundred checks and tests of your vehicle’s emissions system, which includes the automatic transmission too. If your problem has been corrected, generally the “Check Engine” light will turn off within a day or two of normal driving. If the light does not turn off, there is a system problem and diagnosis is needed.

Check Engine Light Comes ON again n again

Jeep Cherokee Check Engine Light Will Not Reset

Q: Problem noticed on 1996 Grand Cherokee Lorado has 97K on it. I have taken care of the vehicle pretty well. Recently driving in upstate NY the check engine light came on. When I shut the it off and started it after a few minutes, the light remained on. I went on to remove the battery cable in order to reset the computer; this worked for a little while maybe 3 weeks. Within that time, I was getting very bad gas mileage, so I changed the O2 sensor. The one near the exhaust manifold was fouled and checking the one on the converter was ok . Also I’ve poured Textron additive because it was sluggish on initial take off from a stop. At times I’d lose power when I accelerated hard in overdrive. The light went on again, even when I reset it again by removing the battery cable it came on within the hour and the mileage is still bad. What do you think could be the cause of this problem, or do I need to go to the dealer for a diagnostic check up.


A: Yes you need to go to a dealer or and independent repair facility to get the answer to your vehicle’s problem. Also, whatever you do, "do not" unhook the battery before you go! Unhooking the battery causes the computer not only to reset, but in the process all information that the computer has to share, with the technician servicing your vehicle, is lost. An empty computer file will have no diagnostic information and you will get a bill for telling you there is nothing wrong. So, make the appointment, drive the vehicle and leave the battery alone. With the Check Engine Light on the computer will have the information you need to get your Jeep back to good running order.