Bmw R 1200 Gs P1799 Engine Trouble Code
What is Bmw R 1200 Gs P1799?
With Bmw R 1200 Gs P1799, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
P1799 on the Bmw R 1200 Gs
The Bmw R 1200 Gs ECU flash version prior to the 2.4.1 update has a known calibration bug that can generate spurious P1799 codes under hard deceleration. Verifying the ECU software version is always the first step before any mechanical diagnosis on this model.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Bmw R 1200 Gs |
| Brand: | Bmw |
| Model: | R 1200 Gs |
| Code: | P1799 |
P1799 Bmw R 1200 Gs Symptoms
Check Engine Light
Illuminated Bmw R 1200 Gs dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Bmw R 1200 Gs
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Bmw R 1200 Gs
Increased Emissions
Failed emissions test due to P1799
P1799 Code Structure
Understanding what each digit means in the P1799 powertrain trouble code:
| P | 1 | 7 | 9 | 9 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Rail Pressure Sensor Circuit Malfunction | Crankshaft Position Sensor A Circuit Malfunction | Reverse Input Circuit |
How to Fix Bmw R 1200 Gs P1799
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
Regular maintenance of indicator and headlight bulbs ensures proper function. Maintain paint condition to prevent rust. Modern products make these maintenance tasks straightforward and accessible.
Technical Notes:
P1799 DTC indicating a sensor fault does not always mean the sensor itself is bad. The issue may stem from the systems being monitored or even the sensor wiring. Proper diagnosis is essential.
Bmw R 1200 Gs P1799 Repair Cost
Replacing the lambda (O2) sensor wiring loom section on the Bmw R 1200 Gs costs $90–$160 at a body shop or auto-electrician. This is far cheaper than replacing the sensor itself when the sensor is otherwise functional — always inspect wiring before condemning sensors.
P1799 Description
P1799 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for P1799 OBD-II Engine Trouble Code is: Fuel Rail Pressure Sensor Circuit Malfunction.
Common P1799 Misdiagnosis on the Bmw R 1200 Gs
Workshop technicians sometimes replace the entire ignition coil assembly on the Bmw R 1200 Gs when P1799 accompanies a cylinder-specific misfire. In many cases, only the spark plug in the misfiring cylinder has fouled; a $8 plug replaces a $140 coil pack.
DIY Repair Guide: P1799 on Bmw R 1200 Gs
After any repair that involved disconnecting the battery on the Bmw R 1200 Gs, the power window, steering angle sensor, and transmission adaptive values all require a reset drive cycle. Skipping this can cause false fault codes — including P1799 — for the first two to three start cycles.
Preventing P1799 on the Bmw R 1200 Gs
After any fuel system repair on the Bmw R 1200 Gs, always perform a fuel-trim reset and adaptation drive. Skipping this step leaves the ECU operating on pre-repair learned values, which can generate false P1799 alerts for weeks after the fix.
Frequently Asked Questions — Bmw R 1200 Gs P1799
A: Yes. Any stored fault code — including P1799 — will cause an automatic failure in most OBD-II based emissions tests. The code must be resolved and the vehicle must complete a full OBD drive cycle with no new codes before the test.