Lambda readings

Technical Area Engine, Transmission, Exhaust etc
2

My 1.8 Eunos has just failed it’s MOT because it’s lambda reading is outside the parameters set at 1.061. CO & HC readings were OK. The car had been off the road for six months and the garage suggest a half hour blast up the motorway may resolve the issue, otherwise the talk is of a £50 diagnostic followed by a new Lambda sensor and/or catalytic converter. Is there anything I can do to improve it’s chances of getting through the retest. Any suggestions would be gratefully received.

PS. does anyone know where the Engine Number is on a '94 1.8.

brines  

3

The engine number is stamped onto a machined surface that protrudes from the rear corner of the engine block on the exhaust side. It’ll be BP then 6 digit’s underneath.

You could try one of those miracle cure fuel treatments to see if it helps the lambda reading but chances are the sensor is kaput.

4

Lambda MOT allowable readings are 0.97(rich) to 1.03(lean).  Your reading could indicate an exhaust leak especially as other readings OK.

Give it a good run and check for exhaust or breather pipe leaks.

The MK1 1.8 is a ‘BP’ engine. 

 

Sorry, repeating what Robbie already said, posts crossed 

 

5

That’s my first thought - a little fresh air leaking in after the sensor could give that slightly raised lambda reading.