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

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  • yadayada
    yadayada May 18, 2011

    Sensors don't control codes.

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  • Audi Master
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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.

Posted on May 18, 2011

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1 Answer

CODES P0300, P1128


po300 is random miss fire doubtful two O2 sensors bad at one time most likely coolant temp sensor is bad causing engine to run rich this will cause O2 sensors to throw a code(thats what they are there for..exhaust gas temp. and raw fuel) running rich will also fowl spark plugs(=miss fire) P1128 ??

Mar 20, 2013 | 2006 Jeep Liberty

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What parts do i need to buy for a P1128 code on a 2001 VW passat


That P code p1128 is for a fault with one of the lambda probes on that vehicle, you really need to see which one is not oprating 1st, and make sure wiring is ok to that sensor 1st before just going to buy a new lambda probe

Hope this helps Chris

Jul 27, 2011 | 2001 Volkswagen Passat

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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

What do the codes 1128, 1129, 1133, and 1134 mean on my Porsche Boxter 2001?


code P1128 02 sensor bank 1 lean
code P1129 02 sensor bank 1 lean to limit
code P1133 02 sensor bank 2 lean
code P1134 02 sensor bank 2 lean to limit

fuel system is lean.

Jan 29, 2011 | 2001 Porsche Boxster

1 Answer

I get codes P0102 and P1128. My mechanic says I need to put a new mass air flow sensor on and it will take care of the problem. Is this correct?


This could very well be correct I believe code P0102 is the mass airflow circuit low input. P1128 should be a lean code.

I would first try cleaning your mass airflow sensor with a carb or throttle body cleaner, they have a tendency to get dirty and not read correctly.

Dec 13, 2010 | 2001 Volkswagen Cabrio

1 Answer

Trouble code 1997 Hyundai Elantra, P1128


P1128 trouble code is for (Upstream Heated O2 Sensors Swapped). Did you switch around any of the O2 sensors?

Apr 24, 2010 | 1997 Hyundai Elantra

2 Answers

99 boxter p1128 and p1130. replaced air mass sensor. no vaccum leaks


Remove the MAF sensor and carefully clean the sensing diodes with some solvent and a q-tip. These codes are commonly caused on this car by a dirty MAF that does not see the air entering the engine so fuel is not added by the computer. Then the computer sees that the mixture is lean by looking at the exhaust gas oxygen (sensor) content and it sets a code because it can't trim fuel delivery to the correct level as the MAF signal has more authority.

Jul 07, 2009 | 1999 Porsche Boxster

4 Answers

Trouble codes P0172 and P1128 - VW Beetle


The code P0172 means...system too rich(cyclinder bank No.1)..and all of the OBDII fault codes begin with a "P0"..i dont know what a P1128 is....i hope this will help you

Jun 28, 2009 | 2000 Volkswagen Beetle

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

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