# P0158 — Generic Powertrain — Fuel & Air Metering

> ClearTheCode diagnostic code reference (not OEM service data).

Source: https://clearthecode.com/codes/P0158

**System:** Powertrain · Fuel & Air Metering

**Severity:** moderate

## Description

Fuel and air metering circuit fault. Likely sensor or wiring issue affecting fuel trim. Verify the specific sensor identified by the code and inspect its wiring/connector.

## Diagnostic snapshot

- **Difficulty:** 4/10 — DIY with OBD-II scanner
- **Est. repair cost:** $40 – $250
- **Common symptoms:** Check engine light (MIL)

## Diagnostic workflow

1. Confirm P0158 with a live scan — note pending vs stored and freeze frame data.
2. Verify reported symptoms: Check engine light (MIL).
3. Inspect wiring/connectors and related sensors before replacing modules.
4. Most likely fixes: Replace oxygen sensor(s).
5. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

## Likely fixes

1. **Replace oxygen sensor(s)** (easy)