My dads 99 cherokee had a check engine light on he had it checked and the guy told him its was an o2 sensor, sold him the part and he brought it home for me to install, i put it in and the light is still on. will it go out on its own or do i need to have the code erased?
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Re: check engine light
Get in car Push brake and hold Turn IGN ON/OFF/ON/OFF/ON Wait for flashing lights sequence Write then down (3 blink, pause, 2 blink pause, 7 blink, LONG pause = 327.. then another one comes, and another... these are what is keeping light on
Could be LOW Oil Low Water Low Washer fluid Low Pwr Steering Fluid Worn Brakes Low Trans Fluid Low Diff Fluid Air Bag Deployment Ckt LIGHT out ;-) other.....
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My first question would be, what was the original trouble code that directed the mechanic to replace the sensors ? You seldom need more than one O2 sensor at a time. Its possible the exhaust manifold is leaking and that might cause a problem that would turn on the warning light. Or it could be something else. A valve cover gasket will leak oil if it fails. No check engine light.
No Bad o2 But Check oil Level. How old Was The oil That Came Out? Fresh oil Will Clean Out Sludge Deposits If The oil Was'nt Changed In A Timely Manor It could Have caused leaks. also Check Drain Plug Gasket for leaks And Make Sure Oil Filter Is Correct And Tight.
Harness or connectors (The sensor circuit is open or shorted). Rear heated oxygen sensor (Bank 1) may be faulty. The rear heated oxygen sensor (or sensor 2), after three way catalyst
(manifold), monitors the oxygen level in the exhaust gas on each bank. Check your connections and make sure the right sensor is in the right location.
Check the front O2 sensor. I had a 99 Jeep that would stutter and seem to lose power while accelerating. No check engine light came on but took it to a shop and had them put it on a computer. Come to find out that the O2 sensor was giving the engine misreads and was telling the engine to take in more fuel. Causing one of the cylinders to misfire.
check the fuses , you can have a o2 sensor fuse open, also check the wiring because o2s are close to the cats or manifoldss some time they burn and get shorted.., other thing you can do is unplug the o2s and drive it like that and see if it shuts off , if it doesn't so the problem is around that sensor...hope this help..
Well the water pump sounds bad....it is a cheap fix at $34.00 and will fix the overheating problem. The O2 sensors start at $63.00...but if you have a "check engine light" on, get it read at the parts store for free and see if the code is for the O2 sensor.
Did your "check engine light" come on? If it did, then a mechanic would put a scope on your car's computer to read the malfunction code. The print out would indicate if the check engine light appeared because of a faulty O2 sensor. If you have a faulty O2 sensor it will need to be replaced since this it is the source of information for your car's computer with respect to fuel mixture.