View Full Version : audi a4 b5 hesitation on acceleration problem solved

03-21-2015, 03:46 PM
hey guys

i was had this issue hesitation on acceleration and lose of power and the speed was limited

i changed the fuel pomp fuel filter spark plugs and spark plugs wires hesitation on acceleration yes

i removed the catalyst hesitation on acceleration yes

i changed injectors hesitation on acceleration yes

before all i scanned the car with obd2 tool yes there is fault codes 2 fault codes actually

00561 mixture adaptation not reached

00561 - Mixture Adaptation

00561 - Mixture Adaptation: Adaptation Limit (Add) Exceeded
Possible Symptoms
Engine Jolting
Increased Fuel Consumption
Poor Idling/Jolting
Reduced Boost Pressure
Possible Causes
Mass Air Flow Sensor (G70) faulty
Fuel Pressure too Low
Leaks in Intake Air System and/or Exhaust System
Injector(s) faulty (i.e. coked)
Possible Solutions
Refuel Vehicle
Check Fuel System Pressure
Check Mass Air Flow Sensor (G70)
Check Intake Air System and Exhaust System for Leaks
Check Injection Quantity
Check Injector(s)

P0131 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)

P0134 Oxygen O2 Sensor No Activity Detected

Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust

how i solved the problem the first thing i did i replaced the fuel pressure regulator ans i toke the a4 for test ride yes now power is back still hesitate

so what i did to solve the problem completely i disconnect the O2 Sensor and suddenly no more hesitation on acceleration its gone

so what i got faulty parts on my a4 is

bad Heated Oxygen Sensor and bad fuel pressure regulator

so here you guys i just wanted to share this to help some of you [:)] [:D] [:d]

03-21-2015, 06:56 PM

03-23-2015, 04:27 PM
Lets see a burn out!

03-24-2015, 01:48 AM
Just make sure you replace the O2 sensor, as the ECU still needs that input to correctly meter the fuel trims. You will still have high fuel consumption and slightly rich mixture without it - even on a MAF tune.