Audi 920 P1637 Engine Trouble Code
What is Audi 920 P1637?
Audi 920 P1637 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
P1637 on the Audi 920
Independent workshop data shows that Audi 920 vehicles with P1637 resolve approximately 40% of cases after a throttle body cleaning and idle relearn procedure. This is always the recommended first step before investing in new sensors.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Audi 920 |
| Brand: | Audi |
| Model: | 920 |
| Code: | P1637 |
P1637 Audi 920 Symptoms
Check Engine Light
Illuminated Audi 920 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Audi 920
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Audi 920
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 920 P1637
Diagnostic Steps:
Regarding P1637, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
Power steering pressure switch monitors system operation. If pressure changes are not detected after calibrated speed transitions, this DTC sets. Verify PSP switch operation and check for circuit opens or shorts.
Technical Notes:
P1637 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
Audi 920 P1637 Repair Cost
On the Audi 920, 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 920
When P1637 triggers on the Audi 920, a flashing check-engine light (as opposed to a steady one) indicates an active misfire. Misfire codes are commonly misdiagnosed as sensor faults; always rule out ignition and fuel delivery issues before testing sensors.
DIY Repair Guide: P1637 on Audi 920
For Audi 920 owners without a scan tool, a free diagnostic check is available at most franchised Audi dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of P1637 before committing to any repair.
Preventing P1637 on the Audi 920
The Audi 920 EVAP system requires the fuel tank breather hoses to be flexible and crack-free. A visual inspection at every oil change prevents the slow vacuum leak that triggers P1637 without any drivability symptom.
Frequently Asked Questions — Audi 920 P1637
A: It depends on the severity. If the check-engine light is steady, it is generally safe to drive to a workshop within the next few days. If the light is flashing, pull over safely as soon as possible — a flashing light indicates an active misfire that can cause expensive catalytic converter damage within minutes.