Question about 1995 Dodge Neon

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95 neon revs to 2500 and holds by itself, will stalls while drvin

I have had it hooked to a scan tool, the first time o2 sen.(behind the cat) replaced it. Tested good. Seems to act up after the engine gets to normal temp or after the it goes to closed loop. Then while driving it will start to studder and finally loose all power and stall. If I let it sit for awhile it will start and run fine till it gets warmed up again. Don't know what to do now, the last time it was on the scan tool while it was running everything was working well. Possibly fuel filter, pcm, fuel pump?

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  • jrcreager May 11, 2009

    The coolant temp sens. has been checked



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Check coolant temp sensor need to see if it is reading -40 degrees

Posted on May 11, 2009


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I have a 2003 saturn ion 4 door, it has a ton of miles 194k. Last week the alternator went out do I replaced it without a problem, then the day after the check engine light came on I hook up the diagnostic...


no FSM> and not looking up P0420?
no engine stated, so ill get it wrong too..?????????????
420 is cat monitor failure. "efficiency"
the most hard of all.

ill make a list from hard and expensive .
1: bad sensor 2 rear. you failed to do both, that was WRONG.
2: bad cat. (i can weld on any cat for $99 bucks.) i do it last.. dead last.
3: engine running real bad. BUY a scan tool, now.

so the o2 is new that leaves #2 or #3.
i never shot gun cats. but shops do, its not their cash, huh?

i connect a real scan tool (not one that misses factory DTC codes)
then look at pendings for P042o , see funny sensor readings there, bingo.
i check every PID. for all sensors to be sure they READ right.
is the engine holding closed loop status at idle, no fix that NOW.
is LTFT (long term fuel trim ) near 0 or at - 40 or + 40% (fix that next)
if trim is good, the engine.
If the front 02 is new, the AFR will be correct and the the front 02 will swing fast and the trim will be near 0 , -4 is near best.
tad rich , natural.
once the engine is running Stoich at light flat cruise. (close loop) the
cat will heal its self (bake dry) and stop throwing 420. ( a hope deal)
if not the cat is bad.

ive cured some of the most hard 420s,.

on some ratty engines, a new cat can in fact hide it , until it cooks to death and next year 420 are back.
id never do that because gas is expensive. fix engine first.

Jun 24, 2014 | Cars & Trucks

1 Answer

2000 buick century problems

DTC P0131 HO2S Circuit Low Voltage Sensor 1
The PCM supplies a bias voltage of about 450 mV between the HO2S signal and low circuits. When measured with a 10 megaohm DMM, this may display as low as 350 mV. The oxygen sensor varies the voltage within a range of about 1000 mV when the exhaust is rich, down through about 100 mV when exhaust is lean. The PCM constantly monitors the HO2S signal during closed loop operation and compensates for a rich or lean condition by decreasing or increasing injector pulse width as necessary. If the HO2S 1 voltage remains excessively low for an extended period of time, DTC P0131 will be set.
Do you have a advanced scan tool to check O2 sensor data ?
This video is on a honda but your's works the same
Honda Civic P0131 02 Sensor Diagnosis

Sep 16, 2017 | 2000 Buick Century

1 Answer


Bank 1 should be the drivers side of the engine.Sensor 1 would be the upstream O2 sensor, or the one before the catalytic converter.Replacing it should take care the problem. You will need to clear the code after replacing the O2 sensor.

Dec 27, 2010 | 1995 Chevrolet S-10 CA Edition

1 Answer


The PCM copares switch rates between the front O2 sensors and the downstream catalyst moniters. The catylist moniters are often mistaken as O2 sensors, and they are, but that is not their job, or what they are called.
By comparing the switch rates between the front (before cat) and rear (downstream of cat) the PCM knows if the cat is affecting the exaust, and how much it is affecting the exaust.
If it sees little or no effect o the exaust gases that have passed through the cat, then it decides that the cat is not working anymore, and sets a P0420, or a P0430, depending on which bank it is.
To check this yourself, you will need to bring up data stream on your scanner, watch the upstream and downstream O2 parameters and see if they are following each other closely.
If the cat is working right, you should see a fairly rapid switch rate, probably 5 or 6 times a minute on the front O2, but almost a flat line just above .5 volts on the rear. If the rear is switching often you proabably need a catalytic converter.
You can try resetting the ECM by turning your ignition to the on position (engine not running) and pulling the fuse to your ECM for 30 seconds and then placing it back in. Once the fuse has been reinstalled, start the car and let it idle for 1 min and then go for a test drive.
The engine may stall when you restart it, let is stumble and stall. Just restart it, the ECM is relearning the sensors like it was the first start up the engine ever had then go for a test drive.
This should reset everything and turn your check engine light off, if the check engine light came back on, have it scanned again at Auto Zone, Parts source where they scan free of charge and address the issues the DTC codes points out.
The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those syptoms are there, the converter likely needs replacement.
Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilliscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced as mentioned earlier.
Thank you for using Fixya and be safe.

Apr 18, 2010 | 2001 Chevrolet Monte Carlo

3 Answers

94 chevy 5.7 350 need to reset timing what do i need to do?

start engine and bring to normal operating temp. unplug the base timing connector located in the distributor wiring harness tan wire with a black stripe use a timing light and set timing to 0 degrees at idle the timing marks are on the crankshaft pulley and a tab on the timing cover with numerical indications

Jan 01, 2010 | 1994 Chevrolet Silverado 2500

2 Answers

01 toyota tundra stalls at idle....engine code p0420

Could be a problem with the Catalytic Converter or oxygen sensor (H02S bank 2 )

Sep 09, 2009 | 2001 Toyota Tundra

1 Answer

2000 Monte Carlo SS- Stalls after running 5-15 minutes

Check the plug on the MAF.Wiggle it while its running......see if it stalls or jerks.
Or.......replace the MAF if the plug/wire connections are good to it.
The other 2 codes will not stall the engine.

Remember.....all cars run on used parts.
A good used MAF can be had a lot cheaper than new.

Aug 26, 2009 | 1999 Chevrolet Monte Carlo

1 Answer

I have a 97 blazer with 186000 4.3,it stalls when it gets warmed up.I have replaced 2 O2 sen.,EGR,mass air sen., and wires,rotor and cap. I have checked fuel filter(clear) Cat. converter,and fuel pressure...

It was something that takes a lot of time and money to diagnose.Emissions requires the truck to have an EGR valve (exhaust gas recycle) and this deposits gunk (carbon residue) on your MAF (mass air flow sensor) If you catch it in time you can use a carbon cleaner from Autozone or checker Lightly on the MassAirFlow sensor. If not in time you may have to have either the MAF or EGR valve replaced and these are expensive. After a long period of time being undetected eventually the EGR valve will start smelling like sulfer, this means its to late to clean and save.

Thanks for contacting Fixya.

Jul 26, 2009 | Chevrolet Blazer Cars & Trucks

1 Answer

Chevy exp. 35000, 2000. does not accelerate.

hook up a vacuum gauge and see if vacuum is really low , suspect a clogged cat . will it rev up ok in park ? if no again suspect clogged cat .

Jan 01, 2009 | 2000 Chevrolet 3500

1 Answer

O2 Sensor Bank 1 Sensor 2

That is the O2 sensor right behind the cat. converter. When the cat is clogged it can shoot contaminates in the O2 sensor so sometime just cleaning the sensor will make it work again, if not it will need to be replaced. Mark - ABKS

Oct 02, 2008 | 2001 Dodge Neon

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