Cascabelea y pierde fuerza
 

Buenas noches a todos, soy nuevo en este foro y quisiera toda la valiosa ayuda que me puedan brindar, tengo un hyundai accent 2002, de un momento a otro empezó a perder fuerza en subidas y a cascabelear, lo lleve al mecánico y me dio los siguientes códigos, PO507, PO121,PO171,P1401,P0385, todos están relacionados al sistema de inyección, pero lo que me extraña esque todos estos sensores los cambie hace 2 años, solo el P1401 es nuevo, ahora me dicen que posiblemente la faja de distribución se brinco un diente y debo de cambiarla, si alguien me puede ayudar mucho se lo agradecería.

P0507 - Idle Air Control System RPM Higher Than Expected
- A vacuum leak
- Leaking air intake after the throttle body
- EGR valve leaking vacuum
- A faulty positive crankcase ventilation (PCV) valve
- Damaged/failed/dirty throttle body
- Failed EVAP system
- Failed IAC (idle air controller) or faulty IAC circuit

P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem
- TPS has intermittent open or short internally
- Harness is rubbing and causing an open or short in the wiring
- Bad connection at the TPS
- Bad PCM (less likely)
- Water or corrosion in connector or sensor

P0171 - System Too Lean (Bank 1)
- The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
- There could be a vacuum leak downstream of the MAF sensor.

P0385 - Crankshaft Position Sensor B Circuit Malfunction
- Damaged CKP sensor connector
- Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
- Sensor output open
- Sensor output shorted to ground
- Sensor output shorted to voltage
- Failed crank sensor
- Failed PCM

P1401 has to do with the emissions system. My guess is you need to fix the sensors. Driving on bad sensors for 2 years is beginning to damage the emissions system.

Thanks for your fast answer, but is normal to damage all these sensor at the same time, or maybe one sensor is the principal cause ?