Oxygen Sensor Makes Car Not Start

Posted in Oxygen Sensors | Asked on Aug 12, 2010

My sister has a 1999 Saturn station wagon. Check engine light came on, they brought it to a mechanic and they ran diagnostics, said it was the oxygen sensor, so replaced it. They had the car back a few days, got home from work last night, went to go out 20 minutes later and the car won’t start. Could it be a related problem to the repair?
G-man: She said the lights and radio come on when they turn the key, and that is all.

There are 8 Answers for "Oxygen Sensor Makes Car Not Start"

  1. Michael S says:

    Absolutely not.

  2. G-man 1 says:

    No. A O-2 sensor will not make a car not start just not run as efficient. When you say not start do you mean will crank over but not fire up?

  3. pedro7of9 says:

    as much as i laughed at the paper bag answer..answer 2 is correct…a dead or disconected o2 sensor will not keep a car from running
    1 ever been tuned up 2 most non startes are battery/caonnections.3 not tuned ,,,plugs/wires
    4 fuel problem..filter first,,,pump second

  4. bandit_60 says:

    if the 02 sensor is bad it can fowl the plugs and make it hard to start. i found that out the hard way on my oldsmobile. by you getting a new sensor put in and your light is,nt coming on then i kinda rule it out and say your fuel filter is probably starting to clog up.

  5. pica0331 says:

    An o2 sensor can foul the plugs and make the car idle rough, but it the o2 sensor itself would not cause a failure to start.

    while there may be multiple guess for that problem, since it may be anywhere it the electrical wiring, my best guess would be the crank sensor.

    The crank sensor tell the computer where the crank is in relation to the firing order and timing of the motor. If the sensor is bad (but not completely failed yet) it can cause a situation similar to your description. The car may run fine for a few days without a problem starting, then one day you drive around, shut the car off and a few minutes later attempt to start it and it won’t start. It usually happens after the car is warmed up and driven around for a while and the motor heats up along with the sensor.

    The last time I checked it was a relatively cheap component, but I’m not sure what the labor would run since I usually do all my own repairs.

    Since I didn’t take into account that the car was not starting at all there are several other possibilities.
    1. The simplest first–a fuse, there are two locations for fuses. One is under the hood, the other is inside the car itself. Check any fuses that are for the ignition, they will be abbreviated–ING. This may be a cause, not that likely.
    2. You can try put the car into neutral and the try starting the car.
    3. It could be the starter motor itself.

  6. Nomadd says:

    A fairly common problem when monkeys replace O2 sensors is not running the wires right. Then the wired gets ripped off by the driveshaft or melted by the exhaust and shorts out, blowing the fuse, which keeps the ignition from working.

  7. martinmm says:

    good intentions have your question in a bind. no start dont mean the battery wont power the radio. the battery could be down.

  8. LEXUSRY says:

    THE OXYGEN SENSOR HAS NOTHING TO DO WITH THE CAR NOT STARTING. ALL THE OXYGEN SENSOR DOES IS SENSE HOW MUCH OXYGEN IS IN THE EXHAUST SYSTEM WHICH SEND THE INFORMATION BACK TO THE ENGINE COMPUTER TO CONTROL THE FUEL MIXTURE. WHEN YOU SAID THE CAR WON”T START, DID YOU MEAN THE ENGINE DOES NOT TURN OVER OR NOTHING HAPPEN WHEN THE KEY IS TURN ON.?