Audi Q7 4L Left Exhaust Manifold 4.2L V8 - Used Original Parts

Diagnosis and Common Symptoms

On the 4.2L V8 (BAR/CAS engine codes) fitted to the Audi Q7 4L, the left-bank exhaust manifold is a common failure point due to thermal cycling stress between the cast manifold flange and the cylinder head. Technicians typically encounter fault codes such as P0136, P0156, or P2196 (Bank 2 O2 Sensor Circuit/Signal issues) triggered by exhaust leaks at the manifold gasket seat. Customers often report a distinct ticking or tapping noise on cold start that diminishes as the engine warms up, along with a raspy exhaust tone under acceleration. In more severe cases, a cracked manifold can trigger the Check Engine Light due to lean fuel trim codes (P0171/P0174) as unmetered air enters the exhaust stream before the oxygen sensors. Scan tool diagnostics will often show fuel trim discrepancies isolated to Bank 2 when the fault lies specifically with the left-side manifold.

Introduction

This listing is for a Genuine Used left exhaust manifold pulled directly from an Audi Q7 4L equipped with the 4.2L V8 engine. Every unit in our inventory is Tested prior to listing to confirm structural integrity and absence of cracks at high-stress zones. Sourced from a verified donor vehicle, this part offers a reliable, cost-effective alternative to new dealer pricing without compromising fitment or function. As with all our Genuine Used components, this manifold has been inspected by our technical team to ensure it meets road-ready standards.

Product Details

• Brand: Audi
• Model Compatibility: Audi Q7 4L (4.2L V8, BAR/CAS engine code)
• Part Name: Left Exhaust Manifold (Bank 2)
• Condition: Genuine Used (Tested Working)
• Notes: Visually inspected for cracks and warping
• Notes: Mounting studs and flange surface checked for integrity
• Notes: Direct-fit replacement, no aftermarket modification required