Porsche 907 P1637 Engine Trouble Code
What is Porsche 907 P1637?
With Porsche 907 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 Porsche 907
Service bulletins for the Porsche 907 specifically mention P1637 as a symptom of failed purge solenoid valves in the EVAP system. The solenoid body on this platform degrades in high-humidity environments and should be inspected whenever this code appears.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Porsche 907 |
| Brand: | Porsche |
| Model: | 907 |
| Code: | P1637 |
P1637 Porsche 907 Symptoms
Check Engine Light
Illuminated Porsche 907 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Porsche 907
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Porsche 907
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 Porsche 907 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:
Excessive air inflow may result from vacuum leaks, dirty sensors, or EGR valves not closing properly. Insufficient fuel can stem from dirty injectors, clogged filters, weak fuel pump, or leaking pressure regulator.
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.
Porsche 907 P1637 Repair Cost
When P1637 appears on a Porsche 907, a camshaft position sensor swap costs $140–$260 all-in. This is one of the more affordable sensors on this platform. If the wiring harness is also damaged, add $60–$90 for harness repair or section replacement.
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 Porsche 907
Some Porsche 907 models have a known software bug where the PCM flags P1637 after battery disconnection and reconnect. Always perform an ECU adaptation reset and drive cycle before ordering any parts following battery work.
DIY Repair Guide: P1637 on Porsche 907
When replacing sensors on the Porsche 907, always use anti-seize compound on the thread and dielectric grease on the electrical connector. This simple habit prevents the most common causes of sensor-related callbacks after repair.
Preventing P1637 on the Porsche 907
The Porsche 907 coolant temperature sensor plays a role in fuel enrichment during warm-up. Replacing it as a precaution at 80,000 miles ($25–$40 DIY) prevents the faulty cold-start enrichment that can lead to P1637.
Frequently Asked Questions — Porsche 907 P1637
A: Temporarily clearing P1637 can help determine whether it is intermittent or persistent, but it does not fix the underlying fault. The code will return if the problem is still present. Do not clear codes just before an emissions test without a proper drive cycle.