> Fault Codes
When your engine fails to produce power or you have a Check engine light on most propably there is a fault that someone has to fix.A special code inside your engine managment system is stored in the following formats -> 16805 / P0421/ 001057 .You will need to visit your local workshop to fix that or you can diagnose the car by yourself using any obd / obd2 diagnostic tool.Some common problems that a lot of owners might get with a tuned or not tuned car will be described in general in the following text.
Common Problems and Related Dtcs(Fault codes).
Catalyst efficiency related problems : P0420/p0421/p0422/p0423/p0424 and p0431/p0432/p0433/p0434
The catalytic converter is a part of the exhaust system that looks kind of like a muffler, although it’s job is very different from that of a muffler. A catalytic converter’s job is to reduce emissions from the exhaust.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the DTC codes triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a “wear” type item, that is they are not designed to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.
- P0420 Catalyst System Efficiency Below Threshold (Bank 1)
- P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
- P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
- P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
- P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
- P0430 Catalyst System Efficiency Below Threshold (Bank 2)
- P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
- P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
- P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
- P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
1.Leaded fuel or bad quality was used where unleaded is indicated
2.A damaged or failed oxygen sensor (HO2S)
3.Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
4.The engine coolant temperature sensor is not working properly
5.Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
7.Retarded spark timing
8.The oxygen sensors in front and behind the converter are reporting too similar of readings
9.Leaking fuel injector or high fuel pressure
The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp). You will likely not notice any drivability problems, although there may be symptoms. For example, if the substance inside the catalytic converter is broken or failed, it may be restricting the exhaust which will result in a feeling of reduced power output from the vehicle.
Possible Solutions :
Check for exhaust leaks at the manifold, pipes, catalytic converter.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2S), replace if necessary
Replace the catalytic converter
Overall probably the biggest mistake vehicles owners make when they have a P04XX code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you’re not wasting money replacing parts unnecessarily.
Boost Pressure Regulation Control Range Not Reached : 16683/P0299/000665
The engine managment system is constantly checking the boost levels in you turbocharged petrol or diesel engine.When you have this error it is possible that you boost levels or pressure is not sufficent and below the requested values.
The Powertrain Control Module (PCM) or engine control unit (ECU) continuously monitors the turbocharger system for an underboost condition. The PCM checks for a minimum Throttle Intake Pressure (TIP) Parameter Identification (PID) reading during engine operation, which indicates an underboost condition. DTC P0299 sets when the PCM detects that the actual throttle intake pressure is less than the desired throttle intake pressure by 27.6 kPa (4 psi) or more for 5 seconds.
1.Damaged turbocharger (TC) wastegate regulating valve solenoid
2.Stuck TC wastegate regulating solenoid valve
3.Wastegate stuck open
4.Wastegate control hose open or plugged
5.Air leak between turbocharger and throttle
6.Mechanical damage at turbo/super charger
7.Faulty charge Air pressure sensor
Check tubing for obstructions, cracks, and incorrect fitting connections. Also check the turbocharger wastegate regulating valve solenoid for correct operation.
- The main symptom to the driver is the illumination of the MIL (malfunction indicator lamp).
- You will likely not notice any drivability problems, although there may be symptoms. For example, Reduced Power Output, Black smoke on the exhaust, very high fuel consumption.
Possible Solutions :
1.Check Hoses/Pipes to/between Components
2.Check / Clean / Replace Charge Pressure Control
4.Check Diverter Valve