Shortly after buying my 04 VW Golf, the engine check light came on indicating a fault in the NOx sensor. The engine error code is as follows:
17478 - NOx Sensor (G295) Heater Control
P1070 - 001 - Short to Plus - MIL ON
The sensor is actually pretty expensive to replace, around £400. I'm wondering if it's actually necessary to fix immediately. The engine check light came on not long after I bought the car, so I'm guessing I bought it faulty. But since I haven't drove the car pre-fault, I have no idea if it had an effect on the power of the car, or fuel consumption, and whether or not it's an urgency to fix.
Any advice/suggestions are welcome.