How much does exhaust repair cost?

Exhaust repairs range from $150 for sensor or gasket replacement to $1,200+ for catalytic converter replacement. Exhaust manifold repairs typically cost $400-$800.

Will an exhaust leak trigger a code?

Yes, exhaust leaks can trigger various codes including O2 sensor, catalytic converter efficiency, and exhaust pressure codes. They can also cause the engine to run incorrectly.

P0478

Exhaust Pressure Control Valve High

Moderateexhaust

Overview

The P0478 code means the PCM has detected a exhaust pressure control valve high fault. This code relates to the exhaust system components that manage and monitor exhaust gas flow and pressure. An issue in the exhaust system can affect engine efficiency, emissions output, and overall vehicle performance.

Symptoms

Reduced engine performance
Failed emissions test
Unusual exhaust noise
Check Engine Light (MIL) illuminated

Common Causes

Cracked or leaking exhaust pipes
Failed exhaust pressure control valve
Carbon buildup in exhaust system
Wiring issues in exhaust sensor circuit

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Visually inspect the exhaust system for leaks, cracks, or damage
3Test the exhaust pressure sensor with a multimeter
4Check the exhaust pressure control valve for proper operation
5Inspect wiring and connectors for the exhaust pressure circuit

Estimated Repair Cost

$150 — $1,200

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Toyota TacomaNissan PathfinderKia TellurideHyundai Palisade

Related Codes

P0420 P0470 P0475

More Exhaust Codes

P0470Exhaust Pressure Sensor Malfunction

Moderate

P0471Exhaust Pressure Sensor Range/Performance

Moderate

P0472Exhaust Pressure Sensor Low

Moderate

P0473Exhaust Pressure Sensor High

Moderate

P0474Exhaust Pressure Sensor Intermittent

Low

P0475Exhaust Pressure Control Valve Malfunction

Moderate

Frequently Asked Questions

Minor exhaust codes may not affect immediate drivability, but exhaust leaks can allow harmful gases into the cabin. Have exhaust issues inspected promptly for safety reasons.