Vehicle Service and Repair Blog with Tips
We will constantly update this page, but if you still can’t find what you’re looking for or need some advice, please feel to get in touch our friendly mechanics are more than happy to help.
Tel: 0207 231 8861
Mobile: 07720606274
Still Got Questions? Just Ask Greg!
While our expert tips are here to help, we know that sometimes you need a professional set of eyes under the bonnet.
At GJ Motors, we’ve spent over 30 years providing honest, family-run vehicle care to our local community.
Whether you’re dealing with a complex 1.2 PureTech wet belt issue or simply need a reliable Class 4 MOT, our team is dedicated to getting you back on the road safely. We are proud to be the trusted choice for drivers across Surrey Quays, Rotherhithe, Canada Water, and Bermondsey since 1992.
Don't stay puzzled by a warning light or an unusual engine noise—give us a ring or pop into the garage for a friendly chat. We’re here to provide the expert advice and professional peace of mind you deserve.
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Our Vehicle Repair
Blog With Tips
Case Study: Resolving Blocked Screen Washers
When a customer reported that their screen wash jets had stopped working, we followed our signature step-by-step diagnostic process to ensure a first-time fix.
We began by confirming the fault and checking the relevant fuses, followed by a full system scan with our diagnostic machine to rule out stored fault codes and verify that the wiper stalk was sending a signal.
After removing the necessary components to test the wiring for power and grounds, we pinpointed the failure to the screen wash motor pump itself.
Once the faulty pump was replaced, the system was fully restored, providing the driver with clear visibility and professional peace of mind.
Faulty lambda (O2) sensor
When a customer arrived with the Malfunction Indicator Lamp (MIL)—commonly known as the engine management or check engine light illuminated, we performed a comprehensive diagnostic assessment to identify the root cause.
Using our advanced diagnostic equipment, we retrieved the specific fault codes stored in the vehicle’s ECU, which pointed us toward the exhaust system.
Upon a physical inspection of the components, we discovered that the Lambda (O2) sensor wiring had become badly corroded, preventing accurate readings.
To resolve the issue, we installed a high-quality new Lambda sensor, erased the fault codes, and performed a final system check to ensure the engine was once again running at peak efficiency with the warning light extinguished.
Diagnostic Case Study: Solving a P0105 "Ghost" Fault
A vehicle recently entered our workshop with the engine management light illuminated, prompting a full diagnostic investigation. After connecting the vehicle to our diagnostic equipment, we retrieved fault code P0105, indicating a Manifold Absolute Pressure (MAP) circuit malfunction.
Rather than simply replacing sensors, our team performed a thorough physical inspection, which revealed the true culprit: a poor repair from a previous service.
The air filter housing had been cable-tied to the inlet manifold due to a broken bolt, creating an excessive air leak that was confusing the engine's sensors. We professionally re-threaded the mounting point and installed a correct bolt, ensuring the housing was perfectly sealed against the throttle body. By fixing the root mechanical cause rather than just the symptoms, we cleared the fault and restored the engine’s performance.
Case Study: The Honda Civic "Jump Start Nightmare
A Honda Civic was recently towed to our workshop after several other garages failed to get it running. The trouble began with a simple mistake: the jump leads were accidentally connected to the wrong battery terminals. This "reverse polarity" error caused an immediate electrical shutdown, leaving the car completely lifeless.
While other garages jumped to the conclusion that the Engine Control Unit (Module) (ECU) was fried and required an expensive replacement, we stuck to our core principle: always carry out a fresh, independent diagnosis.
Our investigation started with the essentials. Instead of assuming the worst, we meticulously tested the electrical system and discovered that the 100-amp Battery Power Distribution Fuse had sacrificed itself to protect the car's brain. After replacing the blown fuse and installing a fresh battery, the Honda fired up instantly. By focusing on expert diagnostics rather than expensive guesswork, we saved the customer hundreds of pounds and got them back on the road without the need for a new ECU.
Greg’s Simple Guide to Jump-Starting Your Car
Need a boost? Follow these 7 simple steps to get back on the road without damaging your car’s sensitive electronics.
- Park & Prep: Park a car with a healthy battery close to yours (but not touching). Turn off both ignitions and pull up the handbrakes.
- Connect Red (+): Attach one end of the Red lead to the positive (+) terminal of the flat battery, and the other end to the positive (+) terminal of the working battery.
- Connect Black (-): Attach one end of the Black lead to the negative (-) terminal of the working battery.
- Find an Earth: Attach the other end of the Black lead to a solid, unpainted metal part of the engine (like a bolt) on the car with the flat battery. Keep it away from the battery itself!
- The Wait & Start: Wait 3 minutes, then start the working car's engine and let it run for a minute. Now, try starting your car.
- Run & Idle: Once your car starts, leave both engines running for about 10 minutes to help the battery take a charge.
- Disconnect Safely: Turn off both engines and remove the leads in exact reverse order: Black from your engine block first, then Black from the working battery, then Red from the working battery, and finally Red from your battery.
Still stuck? If the car won't start or the Engine Management Light stays on, there might be a deeper electrical fault. Don't risk a "Jump Start Nightmare"—give GJ Motors a call or Book an Inspection for professional peace of mind.
Maintaining the correct tyre pressure
Date: 05/0/2
Maintaining the correct tyre pressure is one of the simplest yet most vital tasks for ensuring your vehicle remains safe, efficient, and comfortable on the road.
From a safety perspective, properly inflated tyres are crucial; underinflated tyres significantly increase stopping distances—particularly in the wet—and compromise cornering stability, while incorrect pressure across the board increases the risk of a high-speed blowout.
Beyond safety, keeping your pressures topped up protects your wallet by extending your tyre lifespan and improving fuel efficiency. Incorrect inflation causes uneven tread wear, forcing premature replacements, while even a minor drop in pressure (as little as 4 psi) can increase fuel consumption by up to 4% due to added rolling resistance. By ensuring your tyres are set to the manufacturer's recommended levels, you’ll enjoy a smoother ride that absorbs road shocks effectively, providing the professional peace of mind and performance you deserve.
Greg’s simple 3-place guide to finding your tyre pressure (PSI or BAR):
- The Door Frame:
Open the driver’s door and look at the pillar or the edge of the door itself. Most modern cars have a sticker (placard) here showing the recommended pressures for both the front and rear tyres. - The Fuel Filler Flap:
On many cars, you’ll find a small sticker on the inside of the fuel flap. This often includes different pressures for when the car is "empty" versus "fully loaded" with passengers and luggage. - Your Vehicle Handbook:
If there’s no sticker on the door or fuel flap, check the owner's manual in your glove box. There will be a section for "Tyres" or "Technical Data" that lists the exact requirements for your specific model.
GJ Motors
Telephone:: 0207 231 8861
Mobile: 07720606274
WhatsApp
Email: Gjmotors
Address:
17 Plough Way,
Surrey Quays
London,
SE16 2LS
Quality servicing at affordable prices
- Friendly service.
- Affordable prices.
- over 34 years experience.
- All work guaranteed for parts and labour.
GJ Motors is a local garage that has built a reputation for trust with its local customers who are returning to us time and time again for all their Vehicle servicing needs.