My car was throwing a p1124 and p1128 code..we have replaced the front O2 sensor throttle position sensor spark plugs and fuel filter we also checked the pvc hose for leaks found none..we were told that it could be the fuel pump not pumping at the needed psi..can you please tell me 1. how do qwe test the fuel pressure 2. what else it could be? thank you for any help you can give me....
I did some research because the P1128 is an odd code for Hyundai and I couldnt find a lot of information on it, but I found two things that may help and neither point to the fuel pump.
1. P1128 in Hyundai refers to the Mass Airflow Sensor or MAF being defective.
2. There is a TSB from Hyundai, TSB 01-36-022, but I wasnt able to ascertain if that was a specific TSB for the MAF or if it was information on how to test the MAF or some other information.
P1124 seems to be a related code as well but I could find little on it. P1124 in a Subaru is an issue with the Throttle Position Sensor or TPS, but I could not confirm that for Hyundai.
My first suggestion would be to check your air filter and if it has not been changed in a while or is really dirty, then change it as a restriction in air flow might be mistaken by the computer as a problem with the MAF.
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
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I got the same problem, i did the mistake to take an advice from friend, and end up replacing fuel pump, fuel filter, the sensor on the top ( TPS) the sensor on the botom next to the flexible connector, and guess what still the same, finaly we replaced the Mass Airflow Sensor and that was all. no problems the engine power came back again.
My advice just replace the Mass Airflow Sensor, and dont worry about the fuel pump. and the other advice is: if you have a friend like mine tells you what to do, dont listen to him. instead saving me some money, i end up spending twice as much. next time ill take my car to the certified dealer.
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