Audi S6 P1637 Engine Trouble Code
What is Audi S6 P1637?
With Audi S6 P1637, 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.
P1637 on the Audi S6
The turbocharged variants of the Audi S6 are more likely to generate P1637 as boost-related over-fuelling trips the ECU threshold. Inspect the intercooler hoses for micro-cracks that allow unmetered air into the intake stream.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Audi S6 |
| Brand: | Audi |
| Model: | S6 |
| Code: | P1637 |
P1637 Audi S6 Symptoms
Check Engine Light
Illuminated Audi S6 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Audi S6
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Audi S6
Increased Emissions
Failed emissions test due to P1637
P1637 Code Structure
Understanding what each digit means in the P1637 powertrain trouble code:
| P | 1 | 6 | 3 | 7 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Temperature Sensor B Circuit Range/Performance | Injection Pump Fuel Metering Control 'A' High | Shift/Timing Solenoid Malfunction |
How to Fix Audi S6 P1637
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:
Brake switch circuit concerns may involve open or shorted BPP circuits, damaged switches, or misadjustment. Verify stoplight function and follow proper self-test procedures per service manual.
Technical Notes:
P1637 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.
Audi S6 P1637 Repair Cost
On the Audi S6, secondary air injection pump replacement for a P1637 code runs $350–$600. Because the pump is only active during cold starts, symptoms are easily missed. Requesting a cold-start emissions test at the workshop will confirm whether the pump is operating.
P1637 Description
P1637 engine trouble code is related to Shift/Timing Solenoid Malfunction.
Main Cause
The primary reason for P1637 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.
Common P1637 Misdiagnosis on the Audi S6
A catalytic converter is often condemned on the Audi S6 when P1637 appears and an efficiency code is present. Before replacement, verify that the upstream oxygen sensor is not slow-responding — a lazy O2 sensor mimics catalytic inefficiency perfectly.
DIY Repair Guide: P1637 on Audi S6
After any repair that involved disconnecting the battery on the Audi S6, the power window, steering angle sensor, and transmission adaptive values all require a reset drive cycle. Skipping this can cause false fault codes — including P1637 — for the first two to three start cycles.
Preventing P1637 on the Audi S6
Ensure the Audi S6 oil cap and dipstick tube seal are airtight. Even a small crank-case vacuum leak can cause the PCM to log P1637 and, over time, allows moisture-laden air to degrade the engine oil faster than the scheduled service interval.
Frequently Asked Questions — Audi S6 P1637
A: Almost certainly yes. Most faults that trigger P1637 cause the ECU to operate in open-loop mode or apply overly rich fuel trims, both of which increase fuel consumption by 5–15%. Resolving the fault promptly pays for itself in fuel savings over time.