Daihatsu Taft P1642 Engine Trouble Code
What is Daihatsu Taft P1642?
Daihatsu Taft P1642 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.
P1642 on the Daihatsu Taft
On the Daihatsu Taft, a triggered P1642 code almost always warrants an immediate inspection of the exhaust gas recirculation (EGR) system. Carbon build-up inside the EGR valve is a well-documented root cause for this platform.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Daihatsu Taft |
| Brand: | Daihatsu |
| Model: | Taft |
| Code: | P1642 |
P1642 Daihatsu Taft Symptoms
Check Engine Light
Illuminated Daihatsu Taft dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Daihatsu Taft
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Daihatsu Taft
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 Taft P1642
Diagnostic Steps:
Regarding P1642, 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:
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.
Daihatsu Taft P1642 Repair Cost
PCV system overhaul on the Daihatsu Taft — which resolves oil-mist contamination of the MAF sensor — costs $100–$200. The MAF sensor should be cleaned ($15–$25 DIY) or replaced ($80–$150) at the same time to ensure accurate fuelling after the fix.
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 Taft
A catalytic converter is often condemned on the Daihatsu Taft when P1642 appears and an efficiency code is present. Before replacement, verify that the upstream oxygen sensor is not slow-responding — a lazy O2 sensor mimics catalytic inefficiency perfectly.
DIY Repair Guide: P1642 on Daihatsu Taft
The throttle body on the Daihatsu Taft can be cleaned without full removal. Use a clean rag and throttle body cleaner spray with the engine off and cool. After cleaning, an idle relearn is mandatory: disconnect the battery for 10 minutes, reconnect, and allow the engine to idle for 10 minutes undisturbed.
Preventing P1642 on the Daihatsu Taft
Ensure the Daihatsu Taft oil cap and dipstick tube seal are airtight. Even a small crank-case vacuum leak can cause the PCM to log P1642 and, over time, allows moisture-laden air to degrade the engine oil faster than the scheduled service interval.
Frequently Asked Questions — Daihatsu Taft P1642
A: Not always. Across model years, Daihatsu 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.