P1422 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1422 indicates a fault in EGI Temperature Sensor Failure, typically within powertrain controls.

Symptoms

check engine light
rough operation in certain conditions
reduced performance

Common causes

Control module logic or calibration issue affecting egi temperature sensor failure
Electrical fault in the affected circuit
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1422

Confirm P1422 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to egi temperature sensor failure for obvious defects.
Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1422

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P1422?

The vehicle is often drivable with P1422, but plan a repair window to prevent repeat faults.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (generic) in the egi temperature sensor failure circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1422 remains cleared under the conditions that originally set the code.

Fix options

Clear code and confirm through drive cycle.
Test component operation and replace if faulty.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$100-$450

Common mistakes when diagnosing P1422

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1422 in common vehicles

P1422 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1422?

P1422 is commonly set by generic faults affecting egi temperature sensor failure.

How much does it cost to fix P1422?

For P1422, repair costs are typically $100-$450 depending on exact root cause, labor rates, and part quality.

Can I clear P1422 without repair?

You can clear P1422 temporarily, but the code usually returns until the underlying fault is corrected.