When I start my eldo the check engine lite comes and the pead out says SEVICE EMISSICNS SYSTEMS and read out with scanner says CO2 sensor,so do I need to replace all sensors or can I start with a specific one first and which one might it be? is there one that seems to go before the other 3, because what I see on this site that there is 4 of them altogther.Can I clean them or do you have to replace them only?Please any help at all would be very helpful. Is there any way to tell which co2 sensor is bad?
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When it comes on, if your close to a garage or parts store, Have the codes read. Or have them read anyway. Most likely it is the TPS(throttle position sensor). it is under the gas pedal. Check the plug for corrosion. bad location for this..
COULD BE MANY THINGS. START WITH NEW PLUGS. CHECK WITH A SCANNER THAT CAN READ LIVE DATA TO SEE WHAT THE O2 SENSORS ARE DOING. NOT SWITCHING LEAN TO RICH AND BACK OR SWITCHING SLOW CAN CAUSE HIGH CO2. A BAD MAP SENSOR OR MAF SENSOR ALSO . CHECK CODES FIRST
Here is some info for you to read, besides me explaining what ppm is, i also gave you some info of how to solve this, Ain't that special LOL. Mike
Overall Result: PASS or FAIL. A vehicle with a properly operating engine and catalytic
converter will have very low HC and CO readings. However as a vehicle ages the HC and CO
emissions will increase and may become erratic. As a vehicle ages it becomes increasingly
important to be sure that the engine and converter are fully warmed up before the test to
have the best chance of passing the test.
HC (PPM): The parts per million of hydrocarbons (unburned or partially burnt gasoline)
in the exhaust.
CO (%): The percentage of the exhaust that is carbon monoxide (CO).
CO +CO2 (%): Complete combustion in the engine or catalytic converter will result in very
little carbon monoxide (CO) and a high percentage (up to about 16%) of carbon dioxide (CO2)
in the exhaust.
O2 (%): When there is complete combustion in the engine or catalytic converter there is a very
little oxygen (O2) in the exhaust. Usually less than one percent. A higher reading indicates a
problem with the engine, the exhaust system, the sampling system or the catalytic converter.
Vehicles do not pass or fail because of the O2 reading; it is only diagnostic information.
RPM: The engine speed in revolutions per minute (RPM) or N/A.
Cruise Limit: The maximum allowable HC and CO emissions at 2500 rpm. The CO+CO2 (%)
must equal or exceed 6. This verifies an adequate sample of the exhaust has been obtained.
N/A for O2 and RPM.
Cruise Emissions: The emission readings measured at 2500 rpm.
Cruise Result: PASS, FAIL or N/A.
Idle Limit: The maximum allowable HC or CO emissions at idle. The CO+ CO2 (%) must equal or
exceed 6. This verifies an adequate sample of the exhaust has been obtained. N/A for O2 and RPM.
These are the possible problems:
bad o2 sensor
bad EGR valve bad cat bad timing
bad plugs or wires
the less costly fixes include replacement of the o2 sensor and EGR
valve i would not clean the EGR I would buy a new one there are very
cheap you can pick these up at any local parts store .
also run some injector cleaner through your car at least a full tank of
gas and one bottle of injector cleaner should be ran through.
you can also have your timing checked for a relatively low price.
and when you go into to have the vehicle checked make sure the car is
been running because your cat convertor has to be warm in order to
preform at it peak so do not do it when the car is cold.
all of the above are pretty reasonable fixes the general rule of thumb
when you work on your own vehicle is start with the cheapest fix first
then go on to the next.
Ok, if the car is misfiring it probably has a bad air/fuel mixture which can cause fouled spark plugs. The causes of a bad air/fuel mixture would could be a bad oxygen sensors or a bad engine coolant temp sensor. But that car is known for having bad head gaskets. What is probably happening is coolant and/or oil is leaking into the combustion chamber. you can check under the cars engine, where the head meets the block, for oil or coolant leaks where they attach. Or check the coolant for CO2 with a CO2 tester (found at auto parts store) and check for low oil. If it tests positive for CO2 in the coolant then its a blown head gasket. once you get the problem fixed you will probably need new spark plugs and possibly a catalytic converter (the longer it misfires, the more fuel will be burned on the cat filter and it will enventually melt)
is this new or did you just notice it? does it go out after you start it? its normal for this lite to lite up as a check of its systems then go out after the vehicle runs. if it stays on after you start it check the coolant level is it good? if so the level sensor is bad. hope this helps
service engine light on Nissan will not damage the car in any manner, however you gas mileage may change slightly. Service engine light can be numerous of issue. Fist I would change the Co2 sensor, 99% that will be the main issue, most people don'trealize that unit need to be replace every 50-75k miles. if that does not solve the issue than take it to the dealership and have them plug it into their computer and it will spit out a code so mechanic can narrow drown on what need replacing. Running bad gas or running low octane can also cause the light to come on. Before you change Co2 sensor, go to Mobile, Shells, Speedway, gas stations and put in 93 or highest octane gas and go to Automotive store and pick up a STP fuel injectors cleaner, mix it with full tank of gas and run it til next refill and see if that light goes off, if not than change Co2 sensor. I believe that truck has 2 sensor if it a V6. the sensor located on the exhaust pipe before catalyst converter. its easy to fix and replace if you have the tools. if you don't know where the sensor looks like or located on the car, just get the new parts and look compare the old to the new. they run somewhere around 35-40 bucks each. Co2 sensor measure amount of burned gas telling the computer if its running rich or lean, if the sensor goes bad the computer get trip and the light comes on. good luck!!
1- u need to check if there is any fuel prusser come to the eng from the fuel pump
2- u need to see if there is any spark come from the spark plugs wire
even if the O2 sensor is bad the car shuold start over