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Failed MOT on emissions
25 Feb 2023 16:49 #247755
by facade
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Replied by facade on topic Failed MOT on emissions
As Fordem says, sensor 2 just checks catalyst efficiency.
An exhaust leak post catalyst will cause high lambda readings
Sensor #1 (the manifold) is a common failure on a Jimny, they go out of spec. and the ecu runs upto maximum fuel trim in closed loop, so then the open loop map is shifted and the fuel consumption nosedives across the board.
High CO is over fuelling from a duff sensor #1, high HC is a missfire which may be an over-lean or over-rich mixture due to a duff sensor #1 or an ignition problem.
If you want to throw money at it, change sensor #1, the generic ones work fine, I bought the cheap one that comes without a plug, and I had to cut my lead and crimp it to the new one.
I think it is 4 wire, I can't remember.
An exhaust leak post catalyst will cause high lambda readings
Sensor #1 (the manifold) is a common failure on a Jimny, they go out of spec. and the ecu runs upto maximum fuel trim in closed loop, so then the open loop map is shifted and the fuel consumption nosedives across the board.
High CO is over fuelling from a duff sensor #1, high HC is a missfire which may be an over-lean or over-rich mixture due to a duff sensor #1 or an ignition problem.
If you want to throw money at it, change sensor #1, the generic ones work fine, I bought the cheap one that comes without a plug, and I had to cut my lead and crimp it to the new one.
I think it is 4 wire, I can't remember.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
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