Nsu Ro80 P1642 Engine Trouble Code
What is Nsu Ro80 P1642?
The Nsu Ro80 P1642 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
P1642 on the Nsu Ro80
Transmission-mounted speed sensors on the Nsu Ro80 share a ground path with the engine control module. A corroded ground point on the transmission bell housing generates electrical noise that the ECU misinterprets as a P1642 fault condition.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Nsu Ro80 |
| Brand: | Nsu |
| Model: | Ro80 |
| Code: | P1642 |
P1642 Nsu Ro80 Symptoms
Check Engine Light
Illuminated Nsu Ro80 dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Nsu Ro80
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Nsu Ro80
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 Ro80 P1642
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
Repair Solution:
Crankshaft position sensor signals the computer for precise ignition and fuel injection timing. Faulty sensors cause rough running and reduced efficiency. Modern vehicles enter limp mode and illuminate the check-engine light.
Technical Notes:
Parts or components should not be replaced based solely on P1642 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Nsu Ro80 P1642 Repair Cost
When P1642 appears on a Nsu Ro80, 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.
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 Ro80
When Nsu Ro80 presents P1642 with a concurrent coolant temperature DTC, technicians sometimes replace the thermostat rather than the coolant temperature sensor (CTS). The CTS is a $15–$25 component; the thermostat job carries 1–2 hours of additional labour.
DIY Repair Guide: P1642 on Nsu Ro80
For Nsu Ro80 owners without a scan tool, a free diagnostic check is available at most franchised Nsu dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of P1642 before committing to any repair.
Preventing P1642 on the Nsu Ro80
For diesel Nsu Ro80 owners, a DPF (Diesel Particulate Filter) regeneration run on the motorway every 500 miles prevents soot blockage that back-pressures the exhaust and forces P1642 flags via the pressure differential sensors.
Frequently Asked Questions — Nsu Ro80 P1642
A: Not always. Across model years, Nsu revised sensor specifications, wiring paths, and ECU calibrations. Always confirm the repair procedure matches your specific vehicle's production year and engine code, as parts and labour times can vary significantly.