P1104 Code: Meaning, Symptoms, Causes & Fix

Overview

When P1104 appears, the control module has detected abnormal behavior related to MAF Ground Malfunction in air metering and throttle control.

Symptoms

surging or unstable idle
engine feels underpowered
poor throttle response

Common causes

Component failure in the monitored system affecting maf ground malfunction
Electrical fault in the affected circuit
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1104

Confirm P1104 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to maf ground malfunction 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 P1104

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

Can you drive with P1104?

The vehicle is often drivable with P1104, 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 maf ground malfunction circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1104 remains cleared under the conditions that originally set the code.

Fix options

Clear code and confirm through drive cycle.
Inspect circuit and connector condition.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$100-$450

Common mistakes when diagnosing P1104

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.

P1104 in common vehicles

P1104 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 P1104?

P1104 is commonly set by generic faults affecting maf ground malfunction.

How much does it cost to fix P1104?

For P1104, repair costs are typically $100-$450 depending on exact root cause, labor rates, and part quality.

Can I clear P1104 without repair?

You can clear P1104 temporarily, but the code usually returns until the underlying fault is corrected.