Check Engine light is on, in my car. Break Unknown Trouble Code P1739?

Question

The check engine light on my car is on.I took it to a mechanic and put 2 new sensors.After like a week or two the check engine light came out again.

Answer 1

I'd take it back to the mechanic. Sensors shouldn't wear out in two weeks, and there's precious little you could be doing to break them.

By the way, one way to help insure parts are actually replaced is to ask them to give you the old ones. You'll probably just toss them afterwards, but they at least have to come up with something to hand you.

Answer 2

There are many components that work together in the engine to maintain optimal engine performance and economy.
A service engine soon, or check engine light indicates that there is a sensor that is reading a condition that is "out of range".
Simply resetting the light does not solve the initial cause of the problem.
Replacing a number of parts trying to troubleshoot the problem in the hopes of getting the light to stay off is a tremendous waste of time and money.
The simplest, and most economical way to alleviate your issue, is to have an engine diagnostic done by a reputable shop to determine what caused the computer to signal you to begin with.

Just scanning the computer codes won't diagnose the problem. It will only tell you which sensor found a fault.

That being said, if per-chance you feel the need to reset the light in the hopes that it was a "glitch" of some kind, you could disconnect the negative battery terminal for a couple of minutes to clear the check engine light.


O2 Sensor? Probably NOT the problem.
People like to blame the O2 sensor for the problem because that's where the computer fault appears.
However, nine times out of ten, it's not faulty. It is simply reading a condition in the engine that is causing it to send a signal to the computer that there is a fault in the exhaust emissions mixture.
In a V-8 engine if you have a fouled spark plug, the air/fuel won't ignite and cause a rich condition in the exhaust which the O2 sensor reads.
So, there's 8 possible causes.
Loose spark plug wire 8 more possible causes.
Faulty injector? 8 more possible causes.
Vacuum leak? 8 more.

So, there's 32 possible problems that could cause the O2 sensor to trip the computer. Not to mention fuel supply issues, timing, EGR, bad gas, rotor, distributor cap,

Before you yank the O2 sensor and replace it, check the basics first. Otherwise, you could have wasted time and money on the result, not the cause.

Answer 3

That code has nothing to do with the O2 sensors. It's a fault in the third clutch pressure sense circuit in the transmission. If the tranny is acting normally and you have the fluid level right it's probably a bad sensor or wire and won't hurt anything.

Answer 4

Have run in to at my save some circumstances and a few diffrent issues. One lose gas cap or you're fill ing it up whilst your motor vehicle is working. 2 the natNatural Vacuum Leak Detection (NVLD) assembly, it is located on precise of the charcoal canister, it is fixed above the gas tank leaking. purely what I even have seen at my save on the neon's. The evap gadget does a pressuer examine on chilly initiate ups. So the code ought to no longer have been reset once you took it to the save. wish this facilitates. motor vehicle tec...........

Answer 5

replace oxygen sensor.
mike