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Vehicle Condition Report
The Vehicle Condition Inspection goes deeper than a roadworthy inspection.
Read moreCase Study: Engine Warning Light and Rough Running Caused by Rodent Damage
At Cowaramup Auto Tech, we regularly see vehicles come in with warning lights or performance issues that turn out to have unexpected causes. This recent case is a perfect example of why thorough diagnostics and experienced technicians are essential when something doesn’t feel quite right behind the wheel.
The Problem
A customer presented their Toyota Hilux to our workshop in Cowaramup with two clear concerns: the engine was running rough, and the engine warning light had illuminated on the dashboard. The vehicle was still drivable, but noticeably lacking smoothness and performance, particularly under acceleration.
Given that modern vehicles rely heavily on electronic systems and precise fuel delivery, symptoms like these often point to ignition faults, fuel system issues, or sensor failures. As a fully equipped workshop offering diagnostics and repairs across all makes and models, our team began a systematic inspection.
The Initial Diagnosis
Using advanced diagnostic equipment, our technicians scanned the vehicle’s onboard computer and identified fault codes relating to injector performance. This suggested an issue with fuel delivery, but the root cause wasn’t immediately obvious.
Rather than stopping at the scan results, we carried out a physical inspection of the engine bay — a critical step that often reveals issues electronic diagnostics alone cannot detect.
The Discovery
Upon opening the bonnet, the cause quickly became clear.
A rodent had made itself at home on top of the engine, building a nest in the warm, sheltered environment. Unfortunately, in the process, it had chewed through several of the injector wiring looms.
Damaged wiring to the injectors meant that fuel delivery was inconsistent across cylinders, which directly caused the rough running and triggered the engine warning light.
The Repair Process
Once the issue was identified, our team at Cowaramup Auto Tech carried out a careful and methodical repair process:
- The rodent nest and debris were safely removed from the engine bay
- All affected injector wiring was inspected and repaired or replaced as required
- Wiring connections were restored to manufacturer standards
- The system was retested to confirm proper injector operation
- Fault codes were cleared and a full road test was completed
Thanks to the training and up-to-date repair methods followed by our technicians, the vehicle was restored to smooth, reliable operation.
The Outcome
After repairs, the engine ran cleanly and consistently, with no warning lights returning. The customer immediately noticed the improvement in performance and drivability.
This case highlights how something as unexpected as rodent damage can lead to significant engine issues — and why a thorough inspection is so important when diagnosing faults.
Preventative Advice
Rodent-related damage is more common than many drivers realise, particularly in regional areas or where vehicles are parked outdoors for extended periods. While it’s not always preventable, there are a few simple precautions that can help reduce the risk:
- Regular servicing to ensure engine bays are checked and cleaned
- Avoid leaving vehicles parked for long periods without use
- Be alert to unusual smells or debris under the bonnet
- Address warning lights early before small issues escalate
Why Choose Cowaramup Auto Tech
As a Repco Authorised Service centre, Cowaramup Auto Tech is equipped to handle everything from routine servicing to complex diagnostics and repairs. Our technicians are continuously trained in modern vehicle systems, ensuring accurate fault finding and reliable repairs every time.
Whether it’s a straightforward issue or something completely unexpected, our team is committed to getting you back on the road with confidence.
If your vehicle isn’t running as it should, or a warning light has appeared, don’t leave it to chance. Book in with Cowaramup Auto Tech in Cowaramup and let our experienced team take a closer look.
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