Jowett Javelin B1805 Engine Trouble Code
What is Jowett Javelin B1805?
When Jowett Javelin B1805 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
B1805 on the Jowett Javelin
On the Jowett Javelin, a secondary air injection pump that has seized due to moisture ingress is a common trigger for B1805. The fault is usually only present on cold starts and clears itself after two to three warm-up cycles, making it easy to overlook.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Jowett Javelin |
| Brand: | Jowett |
| Model: | Javelin |
| Code: | B1805 |
B1805 Jowett Javelin Symptoms
Check Engine Light
Illuminated Jowett Javelin dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Jowett Javelin
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Jowett Javelin
Increased Emissions
Failed emissions test due to B1805
B1805 Code Structure
Understanding what each digit means in the B1805 body trouble code:
| B | 1 | 8 | 0 | 5 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | Engine Oil Temperature Sensor Malfunction | Cold Start Injector 1 Malfunction | Crankshaft Position Sensor B Circuit Malfunction |
How to Fix Jowett Javelin B1805
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
B1805 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
Jowett Javelin B1805 Repair Cost
A fuel pressure regulator replacement on the Jowett Javelin runs $180–$320 at a specialist. Fuel system work requires depressurisation procedures, so this is not typically a DIY job. Some workshops include a full fuel injector flow test (value: $80) at no extra charge.
B1805 Description
B1805 engine trouble code is related to Crankshaft Position Sensor B Circuit Malfunction.
Main Cause
The primary reason for B1805 OBD-II Engine Trouble Code is: Engine Oil Temperature Sensor Malfunction.
Common B1805 Misdiagnosis on the Jowett Javelin
The Jowett Javelin 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 B1805 as a knock sensor fault when the root cause is the shared ground splice.
DIY Repair Guide: B1805 on Jowett Javelin
For Jowett Javelin owners without a scan tool, a free diagnostic check is available at most franchised Jowett dealers during a courtesy health-check appointment. This provides the DTC number needed to research the exact cause of B1805 before committing to any repair.
Preventing B1805 on the Jowett Javelin
For Jowett Javelin owners in high-humidity climates, applying electrical contact cleaner and dielectric grease to the ECU connector pins every two years prevents the corrosion-related signal errors that register as B1805.
Frequently Asked Questions — Jowett Javelin B1805
A: Contaminated or low-octane fuel can temporarily trigger B1805 through knock retard and lean/rich excursion events. If the code appeared shortly after a fill-up at an unfamiliar station, running the tank close to empty and refuelling with premium is a sensible first step.