Nsu Wankel P1642 Engine Trouble Code
What is Nsu Wankel P1642?
With Nsu Wankel P1642, 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.
P1642 on the Nsu Wankel
The Nsu Wankel is particularly susceptible to P1642 faults when the engine management unit receives conflicting sensor data. Owners report that P1642 on Nsu Wankel most commonly surfaces after 60,000 miles, especially when routine service intervals have been missed.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Nsu Wankel |
| Brand: | Nsu |
| Model: | Wankel |
| Code: | P1642 |
P1642 Nsu Wankel Symptoms
Check Engine Light
Illuminated Nsu Wankel dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Nsu Wankel
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Nsu Wankel
Increased Emissions
Failed emissions test due to P1642
P1642 Code Structure
Understanding what each digit means in the P1642 powertrain trouble code:
| P | 1 | 6 | 4 | 2 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Temperature Sensor B Circuit Range/Performance | Injection Pump Fuel Metering Control 'B' High | Glow Plug/Heater Circuit 'A' Malfunction |
How to Fix Nsu Wankel P1642
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:
P1642 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.
Nsu Wankel P1642 Repair Cost
For Nsu Wankel owners, budget the following for a P1642 repair: EGR valve cleaning $80–$120 or replacement $250–$450, intake manifold gasket $120–$200, and a post-repair reset and road test. Total: $350–$650 at an independent garage.
P1642 Description
P1642 engine trouble code is related to Glow Plug/Heater Circuit 'A' Malfunction.
Main Cause
The primary reason for P1642 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.
Common P1642 Misdiagnosis on the Nsu Wankel
When P1642 triggers on the Nsu Wankel, 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: P1642 on Nsu Wankel
Clearing P1642 on your Nsu Wankel with a basic OBD-II reader ($20–$40) is straightforward: plug the reader into the diagnostic port under the dashboard, read the stored code, and clear it. If it returns within one drive cycle, the underlying fault is still present and requires attention.
Preventing P1642 on the Nsu Wankel
Using only genuine or OEM-specification fuel injectors in the Nsu Wankel ensures precise spray pattern and flow rate. Inferior aftermarket injectors are a documented trigger for P1642 through off-target fuel delivery.
Frequently Asked Questions — Nsu Wankel P1642
A: Almost certainly yes. Most faults that trigger P1642 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.