Do you not have any previous MOTs and the smoke results sheet that normally gets stapled to it?

I only got the car last year so no previous mot certificates. I finally got the results from halfords and it does show lambda reading 8.199. I also checked govt mot website and it states that as of 2018, all cars are tested for emissions including lambda reading??

www.gov.uk/guidance/mot-inspection-manual-for-priv...2

Definitely no emission failures on previous mot's.

OK will do. Not had a re map that I know of.

"So turns out halfords did indeed do a petrol test on my diesel car."

A clear case of incompetence. Refund due?

www.gov.uk/getting-an-mot/problems-with-your-test-...s.

Twas my understanding *(though my understanding is often rather out of date) that diesels were only tested for smoke.

That said, I dont see why a gas analyser wouldnt work on diesel exhaust, and if that is the case, I would expect it to show a large excess of oxygen, since its my understanding thats how diesels operate.

So I dont quite understand the comments on it having hardly any air

That said, I dont see why a gas analyser wouldnt work on diesel exhaust, and if that is the case, I would expect it to show a large excess of oxygen, since its my understanding thats how diesels operate.

So I dont quite understand the comments on it having hardly any air

"If the mixture contains too much oxygen for the amount of fuel (a lean mixture), lambda will be greater than 1.00. If a mixture contains too little oxygen for the amount of fuel (a rich mixture), lambda will be less than 1.00."

Hence I didn't understand

:" Any number seriously divergent from 1.0 would mean an engine in dire need of tuning. A figure like 8 would mean the engine was getting hardly any oxygen at all."

but if its the wrong way around, it all falls neatly into place.

On another motoring group I'm on, a Halfords customer is having problems getting a solution for his 9 month old Halfords battery that won't charge and is only reading 3.5v.

Halfords say they will only replace when it shows 0.5v on their tester

<< " Any number seriously divergent from 1.0 would mean an engine in dire need of tuning. A figure like 8 would mean the engine was getting hardly any oxygen at all."

but if its the wrong way around, it all falls neatly into place. >>

Sorry if I got the lambda ratio backwards :-)

I'd be sorry if you hadn't

Because then I'd be confused.