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The P2159 diagnostic trouble code is most commonly fixed by replacing the vehicle speed sensor. Keep in mind that ABS components, other trouble codes, and aftermarket tires may be responsible for this code being stored by the PCM. Take time and complete a thorough diagnosis before replacing the vehicle speed sensor.
There is only one way . Remove it and replace it with a new one. after you get it out check if it is rusted if so replace the others , other wise they will leak later on . fill with new coolant to stop future trouble. If you search around you may find some brass plugs they wont rust out.
Check your hoses between the air flow sensor and the throttle body. If there are no leaks, you probably need a new air flow sensor. or a the very least clean you mass air flow sensor and check the electrical connections. also check for vacuum leaks.
you are having trouble with you MAF, mass air flow sensor. It may be dirty. It is fragile so use the correct cleaner made just for mass air flow sensors. Check the electrical connection for corrosion and tightness.
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?
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.
The trouble code P1128 is for a faulty mass air flow sensor or MAP. This is a common problem with 1999-2000 Accents. There is air leakage within the unit and/or the hot wire in the unit is badly contaminated. A bad MAP will cause the vehicle to bog and loose power.
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