2002 Volkswagen Jetta 2.0L with engine codes P0300, P0301, P0270, and P0139

Question

I have a 2002 Volkswagen Jetta 2.0L motor with a manual transmission. The car has no power, starts, and runs but misfires badly. It's throwing the engine codes P0300, P0301, P0270, and P0139

Answer 1

Hi there,

P0301 indicates a misfire on cylinder 1. Here is a list of possible causes.

P0301 VOLKSWAGEN - Cylinder 1 Misfire Condition
Read more: https://www.autocodes.com/p0301_volkswagen.html

P0270 indicates an issue with fuel injector 4. Here is a list of possible causes.

P0270 VOLKSWAGEN - Cylinder 4 Injector Circuit Low
Read more: https://www.autocodes.com/p0270_volkswagen.html

P0139 indicates an issue with the rear O2 sensor on bank 1. Here is a list of possible causes.

P0139 VOLKSWAGEN - HO2S12 Sensor Circuit Slow Response
Read more: https://www.autocodes.com/p0139_volkswagen.html