P1133 AUDI – HO2S Heater Circuit – Sensor 1 Electrical Malfunction Banks 1 and 2

P1133 AUDI Possible Causes

• Faulty O2 sensor
• O2 sensor wiring harness is open or short-circuited
• Poor electrical connection in the O2 sensor circuit

How to fix P1133 AUDI code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Check engine light on (or service engine soon warning light)

P1133 AUDI Meaning

A heated exhaust oxygen sensor (HO2S) indicating rich at the end of a test attempts to correct a too lean condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.