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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (2.9L Pcm 1 - DTCS P2100-00 To P3405-00) >> DTC Troubleshooting >> P2270-00-O2 Sensor 1/2 Signal Biased Lean >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes
EXHAUST SYSTEM LEAK
DOWNSTREAM OXYGEN SENSOR CONNECTIONS
DOWNSTREAM OXYGEN SENSOR WIRING
DOWNSTREAM OXYGEN SENSOR

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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