Question about 1996 Plymouth Neon

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96 plymouth neon

Check engine light was on, code read system lean bank 1
replaced the o2 sensor.
check engine light came on again.
Got the same code
there were 4 different things that could be wrong.
o2 sensor,
misfire on cyl. one
bad injector

With not having a bunch of money, what should I try next?
I got 125 miles on 1 tank of gas
between 40-50 miles an hour, car shudders/stalls

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  • claycitycoon Oct 23, 2008

    It's a 96 plymouth neon.

    83,650 miles on car

    If it' s the converter, why don't I smell it? Usually don't they smell like bad eggs?

    Why would vaccuum leakage make the car lean on a/f mix?

  • Mike Butler
    Mike Butler May 11, 2010

    Do you by any chance have 2 oxygen sensors? Some have one on exhaust manifold & another right after catalytic converter? If yes, which one did you change?

  • butch welch May 11, 2010

    My converter was bad (I didnt smell anything) because of a blown head gasket and the converter was stopped up causing back pressure, Replace it and found several small vacuum leaks. Fixed it. Light went out. I love working on the neon. So simple. I have over hauled mine down to the pistons. I use a autotap machine and I can see everything working. With the Autotap You can see every sensor on the car doing its thing. Has yours not blown the head gasket yet. Lucky. When you get the oil leak that everyone thinks is coming from the head, Its the cam sensor gasket. (o-ring)

  • butch welch May 11, 2010

    Maaan I tell you, that lean code is a pain in the **** on your neon. your computer thing its lean so it just keeps making the mixture more rich to the point that your o2 sensors voltage reaches 1 volt and turns the light on. Fuel mileage goes to ****. If I had to bet on anything I would bet on the converter being half stopped up, causing back pressure on the engine. How many miles on the car.Muffler shops will check it for you, free most of the time I would look for vacuum leaks before I bought anything. Let me know because I have been thru this on a 96 neon.

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dustyboner
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SOURCE: engine code on a neon

it sounds like you have a fuel issue. you should check for proper fuel pressure. its should be 48 PSI.

if its not, it could be a clogged fuel filter, a malfunctioning fuel pressure regulator, clogged fuel pump strainer, or even a bent, kinked fuel line.

if the fuel pressure is correct, its most likely a faulty fuel injector.

by the way, you car doesn't have a mass airflow sensor, it has a MAP sensor

Posted on Oct 22, 2008

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What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

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Firstly block off the EGR with a coca cola can somehow its not necessary ,as for the lean on one bank then read the OBDII with a code reader and with the engine running read the and compare the O2 values ,it may just be a defective sensor on that bank and as its a 96 then it might only have one O2 sensor and not two ,well either way the lean reading is the O2 sensor for sure but which one if two are fitted which it could well have as its a american market vehicle

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You have to perform a smoke test to make sure the intake gaskets r not bad or leaking also check for vacuum hoses first to see if cracked that will also set that code the o2 code should be from the other code u have to fix that first then clear it, drive it to see if o2 code comes up

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Look at exhaust system, after your catalytic converter. Will be threaded into side of exhaust, with wires running to it.

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1 Answer

Engine code on a neon


it sounds like you have a fuel issue. you should check for proper fuel pressure. its should be 48 PSI.

if its not, it could be a clogged fuel filter, a malfunctioning fuel pressure regulator, clogged fuel pump strainer, or even a bent, kinked fuel line.

if the fuel pressure is correct, its most likely a faulty fuel injector.

by the way, you car doesn't have a mass airflow sensor, it has a MAP sensor

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1 Answer

Don't know what system lean bank means.


hi it means you have a lean fuel/air ratio on the cylinders on that side of your engine look for air leaks [hoses gaskets loose manifold bolts etc yates210456

Oct 19, 2008 | 1996 Plymouth Neon

1 Answer

20 mpg down to 11 mpg !


Replace your bank 1 (that's the cylinder bank with cylinder #1 in it, usually passenger side but verify this before changing parts) primary oxygen sensor. This is the one before the catalytic converter. The primary determines your air/fuel mixture, and if it goes bad, the computer will revert to preprogrammed fueling maps, which are fuel-rich by design (to safeguard the engine). Change the O2 sensor on bank one, before the cat, and maybe check your spark plugs as well (running rich too long will foul them) - for the minimal cost, it's worth changing them too.

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