Question about 2000 Volkswagen Beetle

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

2000 Beetle 2.0 - error codes recieved P0134, P0172, P1128. What is the problem and how do I correct it? Do I need to replace a Oxygen sensor? if so which one?

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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

Posted on May 24, 2009

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Engine code p0133, p0134, p1133, p0171, p0172, p0410, p0130


All those codes and such an easy fix. ALL of these codes point to your upstream 02 sensor. It's the one on the passenger side of the engine coming off the exhaust, very very easy to get to. Soak that puppy with PB Blaster then remove the electrical connector and remove and replace sensor. TRY to stay away from Bosch 02 sensors, have been known and reported problems with these. In my case, I didn't have a choice but to buy the Bosch, but I haven't had any problems with mine.

Hope this helps, look to get a tad more miles per gallon too.

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1998 vw beetle codes p0411 and p1128


P0411 Secondary Air Injection System Incorrect Flow Detected
The 4mm inside diameter vaccuum hose gets pinched between the lower intake manifold and the secondary air pump housing, flattening it over time.
Here's a link to the steps to fix yourself if you are mechanically inclined...
http://forums.vwvortex.com/zerothread?id=1995162

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It is very likely this code is coming up because of the vacuum hose as well.

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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

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in AKO look under Self Help> My Library > Fix Your Car > then go to Chiltons or ARRC link from there.

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Trouble codes


The listing of codes that I have states that a P11xx code is related to fuel and air metering. I'd suspect from the past to check for vacuum leaks (broken, cracked or disconnected vacuum lines) or possibly the mass airflow sensor. You can get electrical contact cleaner from Radio Shack, unplug the electrical connector for the mass airflow sensor, and clean it to see if that helps.

Sep 28, 2008 | 2000 Volkswagen Beetle

2 Answers

Trouble codes


what does the code p1128 mean

Sep 21, 2008 | 2000 Volkswagen Beetle

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