Daihatsu Copen P1642 Engine Trouble Code
What is Daihatsu Copen P1642?
With Daihatsu Copen 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 Daihatsu Copen
The Daihatsu Copen features a sequential multi-port fuel injection (SMFI) system where injector timing is tightly synchronised with the crankshaft signal. Wear on the crankshaft reluctor ring teeth produces signal dropout events that accumulate and eventually trigger P1642.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Daihatsu Copen |
| Brand: | Daihatsu |
| Model: | Copen |
| Code: | P1642 |
P1642 Daihatsu Copen Symptoms
Check Engine Light
Illuminated Daihatsu Copen dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Daihatsu Copen
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Daihatsu Copen
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 Daihatsu Copen 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:
Most manufacturers number cylinders sequentially from front to back. Ford V-engines start with cylinder 1 at front left. In V-6 engines, cylinder 4 is front right; in V-8 engines, cylinder 5 occupies that position.
Technical Notes:
For P1642, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
Daihatsu Copen P1642 Repair Cost
A Daihatsu Copen P1642 fault caused by ignition coil failure costs roughly $90–$160 per coil including labour. Replacing all coils simultaneously — rather than one at a time — is recommended because coils typically age at similar rates. This preventive approach keeps total cost below $500.
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 Daihatsu Copen
The Daihatsu Copen knock sensor shares its harness with the coolant temperature sensor. A corroded shared ground causes both sensors to report out-of-range values simultaneously, leading to misdiagnosis of P1642 as a knock sensor fault when the root cause is the shared ground splice.
DIY Repair Guide: P1642 on Daihatsu Copen
For Daihatsu Copen owners without a scan tool, a free diagnostic check is available at most franchised Daihatsu 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 Daihatsu Copen
The Daihatsu Copen benefits from an intake manifold decarbonisation at 50,000-mile intervals when direct injection is fitted. Carbon build-up on intake valve stems restricts airflow and creates the lean conditions that trigger P1642.
Frequently Asked Questions — Daihatsu Copen P1642
A: Yes. Some fault conditions, particularly those involving EVAP system leaks or marginal sensor readings, store codes without producing noticeable drivability symptoms. These are called memory faults and still need to be addressed because they will eventually cause performance issues.