I have trouble codes P0172 and P1128 - VW Beetle 1999.
I did some investigations, looked at the vacuum hoses (nothing obvious). According to Hanes manual, I did the check of the electrical connector to the MAF. It says that one of the terminals should have ~12V but I get no reading on it. Checked the fuses, all good.
What to do next?
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
I had the exact same problem, P0172 and P1178 on a 2000 New Beetle GLS. My CEL would come on after several days of driving. I was able to solve it with a Mass Air Flow sensor cleaning. The CEL went out after about 3 days of short trips. Thanks for the posting.
99 Volkswagon Beattle - I got P0341 and P1128 ----- P0341 is going to be the camshaft - and P1128 is going to be "Long term fuel trim B1 system too lean" - as for the p1128 code, I'm going to try to clean the MAF sensor and also do a Throttle body service. I'll let you know if it works.
Probably maf sensor
SOURCE: 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.
SOURCE: 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
SOURCE: 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
P1128 Long Term Fuel Trim Is Too Lean
It is very likely this code is coming up because of the vacuum hose as well.
MasterThis is the code info: 17990 P1582 Idle Adaptation at Limit
The idle control system on your car compensates to keep the engine idling properly, when it has to over compensate, it sets a code. Vacuum leaks are a main cause, but it could also be the result of one of the sensors in the engine management system. Perform a visual check of the vacuum lines and intake hoses and look for loose clamps, disconnected hoses etc
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Thanks. I know what they mean.
I tried cleaning the MAF with the MAF Cleaner - did not help. I'll recheck the vacuum hoses as most of the forums advise that, but I doubt I'll find anything new. I thoroughly checked them already.
I guess, my next step would be to change the MAF or check the MAF connector and wires again, but I don't know where they lead and originate.
Thanks. I know what they mean.
I tried cleaning the MAF with the MAF Cleaner - did not help. I'll recheck the vacuum hoses as most of the forums advise that, but I doubt I'll find anything new. I thoroughly checked them already.
I guess, my next step would be to change the MAF or check the MAF connector and wires again, but I don't know where they lead and originate.
Thanks. I know what they mean.
I tried cleaning the MAF with the MAF Cleaner - did not help. I'll recheck the vacuum hoses as most of the forums advise that, but I doubt I'll find anything new. I thoroughly checked them already.
I guess, my next step would be to change the MAF or check the MAF connector and wires again, but I don't know where they lead and originate.
I solved the P1128 and P0172 codes. I replaced the MAF and the codes are now gone!
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