I have engine codes p1557,& p1570 set on my 2001 jetta tdi.what do i need to fix.

have you had the codes reaset ? if so then i'd think your looking to get the eng control module changed

Hi. this code refers to the lambda probe heater circuit. This will need a new sensor if the wiring tests good. If the fault still returns, then replace the engine ecu. ( some control units did have a software update to fix this, but this would have to be done at a dealership) I have found thatthe units I have updated still needed the lambda probe.

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored. Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC's stocked inside ECM & reset it.

P1296 is a cooling system malfunction. The two things that will set this DTC is a defective Engine Coolant Temperature (ECT) sensor or the thermostat.

p1557
charge pressure postive deviation

check your timing something could have moved out of time.your computer knows something is wrong but has no adjustment left to compensate.

You can disconnect the battery connection and connect them again. If it has a check engine light, it will pop up again untill the problem is fixed. If you are trying to get an inspection, there is way around it but to fix it.

I can help you to fix this problem. "Fault code: P1557 - Turbo Boost pressure control exceeded"
But I need some info from your engine:
- what type of engine do you have (engine code: ex.ALH, AJM, AWX, ...) or power in kW (PS)
- how many km (miles) are your car?

My e-mail adress is: [email protected]

Your car goes in "limp mode"!!!
If you scan the EDC-15P engine control unit with a VAG or KTS -BOSCH diagnosis tool you will find this:
"Fault code: P1557 - Turbo Boost pressure control exceeded"
You must try follows if you are able to do this:
1. Engine stopped and ignition switch off. Check all pneumatic connections and hoses between turbocharger actuator = pressure unit for boost-pressure control, boost-pressure control solenoid valve, vacuum reservoir, EGR control solenoid valve, intake-manifold flap solenoid valve, EGR valve with throttle - part of intake manifold. Also the vacuum connection between tandem pump and brake booster. If you find something wrong replace parts. If not go to step 2.
2. Extract the hose of the turbocharger actuator = pressure unit for boost-pressure control part of turbocharger. Instead of the original hose you must place another 1 meter long hose with the same inside diameter, and then you check to inspire yourself the air from the other one extremity of this hose. The mechanical connecting rod of the turbocharger actuator must have a smooth and whole motion. If you can do that with your mouth, then you must replace the boost-pressure control solenoid valve. If you can not reach this with your mouth, then you go to step 3.
3. This is the most difficult work. The problem is that the soot particles deposits inside the turbocharger plugging the variable nozzle geometry mechanism = adjustable vanes of the turbine. If the turbocharger actuator is not able to adjust the turbine vanes the charge air pressure increase too much and ECU (engine control unit) go in "limp mode" = engine protection software. As a result the "limp mode" engine still running until you turn the engine off (ignition switch off) and back on when the "limp mode" is deactivated, but the fault ("Fault code: P1557 - Turbo Boost pressure control exceeded") still remain in ECU memory !!!
4. You must be able to extract the turbo from the engine and then to disassemble the turbocharger, clean inside adjustable vanes mechanism and refit all.
It is some work to do here, but after that you will be full satisfied! NO MORE "LIMP MODE"!!!

the transmission works properly after restarting so mechanically the transmission is fine
Run the fault codes to determine the problem area ( TR, TCM, VSS ,solenoids and servos) check for wiring harness problems and water in the connections