Question about 2000 Hyundai Elantra

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2000 Elantra Dash board check light is on.

Scan tool diagnoise indicate P1128 Fuel System Lean Part Load. What is the cause for this?

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Intake manifold gasket leak vacuum leaks, a defective MAF sensor, low fuel pressure under a load or a defective O2 sensor.

Posted on Feb 10, 2009

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I have a tailblazer 2006 that gives the obd code po171 i need a graft that shows what all it could be


Trouble Code: P0171

Fuel Trim System Lean

Possible Causes:


Test for fuel contamination. Small amounts of water can be delivered to the fuel injectors and cause a lean exhaust indication. A lean exhaust indication can also be caused by too much alcohol in the fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .The system will go lean if an injector is not supplying enough fuel.A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions .

Feb 14, 2013 | Chevrolet Cars & Trucks

1 Answer

Hyundai error code p1128 lean fuel mixture


Hi there:
DTC P1128 is "Long Term Fuel Trim Too Lean"
This means the air/fuel mixture is leaner than the HO2S can compensate for.


This is most often caused by a vacuum leak. It can also be caused by a clogged fuel filter, unmetered air entering the air intake system, leaking exhaust system, canister purge system not operating or a weak fuel pump.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 10, 2012 | 2007 Hyundai Accent GS Hatchback

1 Answer

Code p1128 weak mixture lose power on inclines engine light on melts spark plugs vehicle hyundia accent 2001


Go to www.hmaservice.com and register your vehicle by VIN #..
you'll then have access to wiring diagrams, shop manuals,
service bulletins, illustrations, etc. To diagnose a 2000 or 2001 1.5L Accent Diagnostic Trouble Code (DTC) P1128 (FUEL SYSTEM LEAN -- PART LOAD), check the following:
  • Check the intake system for air leaks.
  • Check that the Mass Air Flow (MAF) Sensor (P/N 28164-22610) operation meets the specifications listed below. If the MAF sensor output is significantly lower than the reference value (10% or more), then replace the MAF sensor.
Table 1: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (kg/h) 10
21
30
47
RPM IDLE
2000
3000
4000
Table 2: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
3.5
5.1
7.4
MAF (g/h) 2.8
6
8.5
12.7
RPM IDLE
2000
3000
4000


WITH MANUAL TRANSMISSION


Table 3: Using the Hi-Scan Pro in the Hyundai Diagnostic Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (kg/h) 9.5
19.4
28.8
43
RPM IDLE
2000
3000
4000
Table 4: Using the Hi-Scan Pro in the OBD-II Menus Current Data Screen TPS (%) 0
2.4
3.9
5.9
MAF (g/h) 2.5
5.5
8
12
RPM IDLE
2000
3000
4000

Jun 26, 2011 | Hyundai Accent Cars & Trucks

1 Answer

2001 TT Q OBD code: P1128 / which sensor controls this code ?


CODE P1128 LONG TERM FUEL TRIM ADD BANK 1 SYSTEM TOO LEAN CONDITIONS.SOUND LIKE YOU HAVE WEAK FUEL PRESSURE.FUEL PRESSURE SHOULD BE WITH NEW FUEL FILTER 36 PSI FOR THE ENGINE CODE AMU. AND FOR ENGINE CODE AEB 50 - 58 FAULTY MAF SENSOR.CLEAN FUEL INJECTORS THEY COULD BE CLOGGED CAUSE LEAN FUEL CONDITIONS,FAULTY SECONDARY AIR INJECTION SYSTEM COMBINATION VALVE STUCK OPEN OR SECONDARY AIR INJECTION SYSTEM HAS A ELECTRICAL SHORT OR ECM CONTROL FAULT.CHECK FOR INTAKE MANIFOLD VACUUM LEAKS. CHECK ALL VACUUM HOSES ON THE INTAKE.

May 18, 2011 | 2001 Audi TT

1 Answer

Check engine klight was on and read a code of P1128 on themachin but nothing else . Where is the problem to fix it ( Possible to get it in French but no necessary)


A quick check on the net indicates MAF sensor or intake leak:

P1128 - Long Term Fuel Trim Multiplicative System Too Lean.
The ECM will set a code and the MIL will turn on if the long-term fuel trim value goes from 10% to 15% lean for 30 seconds during two driving cycles when the following conditions are met:
1.- Engine loads exceeds 1.8 milliseconds.
2.- Engine coolant temp. is above 158F (70C).
3.- Canister purge system is not operating.
4.- Mass air flow is less than or equal to 5.5grams per second.
5.- Engine speed is below 1000RPM.

Did you erase the codes? Did you put in a new MAF sensor or a junkyard sensor? Check the intakes for cracks or holes?

Good luck.

Mar 17, 2010 | 2000 Hyundai Elantra

1 Answer

Hyundai Elantra 2000, engine light code 1128


Code 1128 on a Hyundai is a lean mixture fault
http://www.freeautomechanic.com/diagnostictroblecodes11.html

"lean" means the engine is not getting enough fuel. Or the sensor is indicating a lean mixture.
Causes include...
oxygen sensor or wiring bad- located in the exhaust pipe
plugged fuel filter- located in the fuel line, specific location varies by car
MAF sensor or wiring bad (Mass Air Flow).- located in the air intake
low fuel pressure due to failing fuel pump or failing pressure regulator.
leaks in the intake manifold
leaking or disconnected vacuum lines



Jan 08, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

What does code number P1128 mean when light is on


P1128 - Long Term Fuel Trim Multiplicative System Too Lean.
The ECM will set a code and the MIL will turn on if the long-term fuel trim value goes from 10% to 15% lean for 30 seconds during two driving cycles when the following conditions are met:
1.- Engine loads exceeds 1.8 milliseconds.
2.- Engine coolant temp. is above 158F (70C).
3.- Canister purge system is not operating.
4.- Mass air flow is less than or equal to 5.5grams per second.
5.- Engine speed is below 1000RPM.

Please Rate Me =]

May 28, 2009 | 2001 Hyundai Elantra

1 Answer

2.0 engne - errors codes p0134, p0172, p1128. What is the problem and how od i fix it?


Trouble Code: P0134


HO2S (Bank 1 Sensor 1) Circuit No Activity

Possible Causes:


Leaks present in the exhaust manifold or exhaust pipes

HO2S signal wire and ground wire crossed in connector (voltage jumps)

HO2S element is fuel contaminated or has failed

ECM has failed



Trouble Code: P0172


Fuel System Too Rich (Cylinder Bank 1)

Possible Causes:


Camshaft timing is incorrect, or the engine has an oil overfill condition

EVAP vapor recovery system failure (may be pulling vacuum)

Fuel pressure regulator is damaged or leaking

HO2S element is contaminated with alcohol or water

MAF or MAP sensor values are incorrect or out-of-range

One of more fuel injectors is leaking



Trouble Code: P1128


Long Term Fuel Trim Add. Air. Bank 1 System Too Lean

Possible Causes:


Fuel pressure is too low or fuel quantity supplied is too low

Fuel filter faulty

Transfer fuel pump has failed

Fuel injector is faulty (sticking or not opening)

Engine speed (RPM) sensor is faulty

MAF sensor circuit open

MAF sensor circuit shorted to ground

Air leak in the manifold

Secondary air injection system combi-valve stuck open

Secondary air injection system electrical short

ECM has failed

May 24, 2009 | 2000 Volkswagen Beetle

1 Answer

Accelarating problam.


The Probable Causes are Fuel Filter, Fuel Pump, Fuel Pump Relay. Please Rate My Response! Thanks!

Jan 31, 2009 | 2000 Hyundai Elantra

2 Answers

Trouble codes


what does the code p1128 mean

Sep 21, 2008 | 2000 Volkswagen Beetle

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