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DiagnosEdd

Welcome to DiagnosEdd, I diagnose cars, and my name is Edd. I hope you will enjoy seeing some of the jobs I do at the garage I work in.

This page is just for fun and not educational purposes.

14/06/2026

AMG A35 in for rough running and fuel smell. Only DTC was for injector limit. Fuel trim at -14% and the oxygen sensors were showing a rich mixture, coolant temperature fine etc. All tallying so far. 🕵️
TSBs for cylinder head issues was concerning 😬 so we put forward for pulse sensor diagnostics. Something I needed some more experience in💪
Hooked up one in the intake and my own homemade one in the tailpipe (shout out to my bro Matt for the 3d print 😘). Amps clamp showing the relative compression and a cylinder one sync on the ignition with the paddle probe. Injectors disconnected as to not affect results.
We found a repeatable issue on cylinder one power stroke. Every time the cylinder was on power, a wrinkle came up from the tailpipe sensor 💨
This was the evidence we needed to go in with the bore scope. Noted excessive soot on spark plugs cylinder one, these are only 3weeks old. In the cylinder we could see cylinder one exhaust valve showing sooty marks from not sealing. Articulated borescopes are great 😎
So unfortunately it's new cylinder head time. The fact Mercedes has revised the design twice since the car was made is a little telling 🫣

11/06/2026

Nice bit of training today with Steve Rouse from Vehicle Technology Solutions 😎
Covering some texa features, autel EV and secure gateway technology and how we use it.
Interesting stuff! All the security because two kids hacked a jeep 🤯
Thanks Steve 👍

07/06/2026

Audi sq5 in with a veritable cornucopia of warning lights ⚠️
As most every vehicle system relies on vehicle speed for something or other, so it's often a fair bet that ABS faults if found are to blame.
I'm trying to think of a non intrusive way of fault finding, but I've had VAG sensors that had mechanical DTCs yet not circuit DTCs and it was the sensor at fault before; you'll be down to 12v and earth on the scope just like the wheel isn't turning 🛞
Well I over layed the OSR to the NSR sensor and readings come back. Swapped the sensor as it's the only valid test I had, still nothing ❌
So I put through for a wheel bearing suspecting a reluctor issue. Wasn't wrong was I 😂
I genuinely have no idea what has happened though 🤷 it's like a sharp edge has lathed the material off 😳
I cleaned the area thoroughly with a roloc disc, reassembled and live data'd it, putting all four wheel speeds on a reasonably slow graphing mode to show any drop outs. All things working as they should ✅

01/06/2026

2021 vauxhall movano
I got into this one half way through. My colleague had fitted an adblue injector and had the DPF cleaned as the injector had decided to go full open and drown everything in adblue. After this, it set a Nox sensor 2 learning code, which dealer bulletin says change the sensor. This had no effect 🤦
I hit the Opus IVS EU/RoW hotline and the master tech (Boris, he's amazing!) showed me the service bay inducement test. I tried it, and fifteen minutes in it blew burning adblue everywhere 🤮 you can see the results as nox 2 hit 3000ppm!
So we have an obvious excess of adblue 🤔 back on the ramp I ran an adblue injector leak test and checked the pressure from the tank. All ok ✅
Wired a resistance box in to simulate the injector and scoped the pattern, was a really good waveform. This was in service bay inducement again as these can take 30 miles to induce after resets 😐
What then happened solved a lot. Scr conversion without injecting adblue, a healthy 60% until adblue dissipated 🤯
So what actually happened? Lots. The learning DTC comes from when resets done for dpf/scr cleaning and when nox sensor 2 came online it was reading a ppm much higher than it wanted to see. Why? It seems a lot of residual adblue left in the scr had to burn off to achieve the readings the pcm wanted to see.
Covered all bases, fitted a new thermostat to raise all temperatures for better inducement. Online software update (opus again, they're so good!) as if failed service bay test on catalyst temperature (known issue). Lots of road testing got it inducing and all EOBD monitors set 😎

26/05/2026

Easy Tesla job ✅
Passenger window inoperative, down a little at the edge. Doesn't make a sound or click or anything 🤔
Entered the service mode and used the multimedia screen as it's own diag tool 😎 checked live data of the switch functions, DTCs and ran a calibration of the window. That timed out, not even a hint of it doing something 🤷 Tesla instructions say force power down reset next, done that- no dice 🎲
Pulled the door card, someone had removed the motor and cable tied the regulator 😂
Not what you expect from a 3 year old model 3 with 17k on the clock!

20/05/2026

Should be simple, BMW 116i with a vibration.
Actually it had an intermittent misfire that took a 15min drive to replicate 🚗
Misfire cylinder 1 identified ✅
These things have a reputation for eating injectors, but they aren't fun to access. Easy test,move the coil pack ⚡
It moved 🥳 four new coils and plugs ✅
But when you get a faulty new coil pack that just happens to fall into that cylinder; things get weird 😵‍💫
Found a great test that involved disconnecting the valvetronic at full valve lift 💡 drives like a normal car and opens the valves fully to highlight or prove valvetrain or intake misfires.
Valve opening at idle and low torque is only 2mm 🤯 and that low airflow can be a breeding ground for compiling issues. Full lift is 9mm, healthy airflow 💨
We found the problem, made a new problem and fixed that like a professional with quality test procedures 👍
Bosch kts mode 6 made light work of tracking misfiring cylinders.
Four quality coils and the vehicle is spot on.

14/05/2026

2021 vauxhall Corsa E. Electric vehicle 🔋
In for spanner light on and electric traction fault message on the dash ⚡
It turns out the AC pump had an internal fault.
Say what? 🤔 AC fault is a major dash warning ⚠️? Well yes, because gone are the days when all AC done was to make you cold and your engine economy fall off a cliff. This is a super complex system that uses refrigerant to cool and heat not just the heater but the electric motor and the traction battery pack!
Used oscilloscope testing to check the control unit power supply and LINbus communication before writing it off ✅
Fitted a new AC compressor unit , filled with fresh gas and coded with diagbox 👍 it's running nice and cold ❄️ just wrap it up tomorrow with a roadtest and check it charges before the customer gets their car back 🚗

08/05/2026

2023 range rover. Customer complaint of battery going flat after SOTA update.
The update thing is just a coincidence, SOTA updates on these are 99% infotainment bug fixes.
So I went to check the battery. I couldn't! It's bolted from underneath with no access. A bit of reading and the reason becomes clear 💡 it's a 12v lithium starter battery 🔋
I tried the battery test on our JLR dealer tool, it wouldn't complete. And reading under the bonnet it takes a max of 13.6v charging/jumping ⚡
Our lovely new gysflash chargers actually have a lithium battery setting, so I charged it and carried out the topix test again, "do not replace battery". Which is nice because it's 90mins to change and over £1000 🤯
Turns out there's a more conventional software update available for quiescent drain, carried out successfully by my colleague 👌 nice bit of learning right there 👍

01/05/2026

Porsche 718 Cayman failed it's MOT on EML and traction control light 💡
Initial code scan pointed us towards a fault with the exhaust cam sensor on bank 2. Located, called in a wiring diagram.... Wished I hadn't 😂 it's entirely 🔵 wires, because the dealer tool is interactive😬 I don't have that.
Checked it's fused supply with load and voltage, all ok. I couldn't check the earth as it goes to half the sensors on the car. I scoped the waveforn and referenced it with the inlet cam sensor. Way down on output voltage ❌
It's a hall sensor and a low output is going to be down to power/ground, low magnetic inductance due to reluctor/swarf or the sensor has issues. I pulled the sensor out and checked what I could. I knew the power was good so I looped the earth across to the intake sensor to rule out local wiring. Confirmed dead sensor. And that's apparently pretty rare, even more so given the car has only done 14k miles 🤯
Genuine new sensor and a good road test, MOT retest and the owner has their beautiful car back 😎
Of course I scoped it after, confirming I did indeed fix it 🔧

29/04/2026

One Zoe, two Zoe, three Zoe....... More?!?! 🤯🤣

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