Question about 1997 Dodge Neon

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Engine burning leam.

I have replaced both oxygen sensors up stream and down stream sensors,this cleared that error code.
Now the service engine light is back on with a new problem,bank 1 said the engine is burning lean.I don't have the error code,I am geting the worst mileage from a 2.0 dohc 4 banger engine.
P.S. I had the heads rebuilt installed new timing belts and gaskets I have no compression leaks.But I do need to replace the automatic 3 speed transmission.
Thank You
Ron Wharton

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Replace the egr valve unit.make sure u do not have a vacuum leak in the line that lead in and out of the EGR unit.the egr controls how much fuel to dump into the injectors depending on the vacuum pressure in its system.sometime to much fuel sometimes to little fuel.

Posted on Oct 28, 2008

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Where is the O2sensor bank 1 at with a code of P0420. AND do I need to replace both sensors upstream and down. Or just the one that is showing up on the obd scanner.


Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

Jan 02, 2017 | Cars & Trucks

1 Answer

Now here's the weird part I had the o2 sensor changed ( down stream) the check engine light was cleared but it keeps popping back on saying that the heater circuit is low.....P0037 is the code


The folks that worked on it, have to continue on
& work on the heater circuit wiring

You don't need to clear any codes or check light
It will go off when the Oxygen Sensor Monitor runs

In your case, you still have not found the problem
The old sensor may have been good

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1 Answer

Engine Service Soon Light On code P0154


Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
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1996 Toyota 4runner 3.4L error code p0133


SAE J2012 Revised DEC2007 lists Diagnostic Test Code (DTC) P0133 as "O2 Sensor Circuit Slow Response Bank 1 Sensor 1"

This code basically means that the upstream oxygen sensor on bank one of your engine is not responding as quickly as it should to changes in oxygen leavels in the exhaust.

The usual causes of this is an oxygen sensor that is just plain worn out (if it has a lot of miles on it) or an oxygen sensor that is contaminated by engine oil or antifreeze leaks causing these fluids to be burned in the exhaust (like bad piston rings, defective PCV valve, blown head gasket, etc.).

In any case, the oxygen sensor needs to be replaced. However it should be noted that if it is caused by contamination like that described above, replacing it will only result in a new oxygen sensor doing the same thing if the cause of the contamination is not repaired.

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1 Answer

O2 sensor is comming up on service engine light warning, auto parts store says that there are 2 sensors on the car. Up stream and down stream. What are the locations for these and how hard are they to...


Hi Steve ..it refers to the location of the oxygen (o2) sensors relative to the engine. The upstream sensor is the one closest to the engine. The downstream sensor is furthest from the engine. Think of it as the way a stream of water, or in this case, a stream of exhaust flows.... From the engine To the tailpipe.
Changing them is no problem, getting to them sometimes can be a bear,, if you can reach them,, its simply remove the old one with a couple of bolts, and unplug it,, and replace

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If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.

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Check engine light on- auto zone scanner shows error code p0053 probable cause: 1.-check circuit fuse 2.-relay defective 3.-check circuit wiring Where are fuse and relay located?


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Need to replace oxygen sensor


TO REPLACE OXYGEN YOU NEED A SLOTTED SOCKET AND A TUBE ANTI SEIZE COMPOUND. MOST OF THE TIME NEW OXYGEN SENSOR ALREADY HAS ANTI SEIZE COMPOUND USED ON THE THREADS.TO REPLACE OXYGEN SENSOR FIRST CRANK VECHICLE FOR A FEW MINUTES SO YOU CAN REMOVE OXYGEN SENSOR MORE EASILY. ONCE YOU GET THE EXHAUST LITTLE WARM.YOU DISCONNECT OXYGEN SENSOR CONNECTOR TAKE SLOTTED SOCKET REMOVE OXYGEN SENSOR APPLY ANTI SEIZE ON OXYGEN SENSOR THREADS THE SCREW IT IN PLACE..WEAR LONG SLEEVES COVERALLS, SAFETY GLASSES KEEP RUST PARTICLES GETTING INTO YOUR EYES. AND LEATHER GLOVES KEEP HANDS FROM CUTS AND EXHAUST BURNS. IF YOU REPLACING DOWN STREAM OXYGEN SENSOR YOU HAVE TO RAISE VECHICLE SUPPORT ON JACKSTANDS. FOR UP STREAM OXYGEN SENSOR YOU CAN REPLACE WITHOUT RAISING THE VECHICLE.REASON I SAY CRANK ENGINE TO WARM UP EXHAUST SYSTEM BECAUSE METAL EXPANDS WHEN HOT THAT MAKES REMOVING OXYGEN SENSOR EASIER. IF YOU DONT CRANK VECHICLE THE COLD CAUSES METAL TO SHRINK MAKING HARDER TO REMOVE OXYGEN SENSOR.POSSIBLY DAMAGING SENSOR THREADS WHILE TRYING TO LOOSEN SENSOR FROM EXHAUST MANIFOLD OR PIPE. YOU CAN BUY SLOTTED SOCKET AND ANTI SEIZE COMPOUND AT ANY AUTO PARTS STORES.

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Check engine light is on


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