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Lotus in the Peak
28th - 30th June 2024

Best Way To Replace A Pre Cat Lambda Sensor?


Jamie Triner

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Hi there,

 

As the topic title says...

 

Planning on tackling this beast next weekend. Just don't know which the is the easiest option, 

 

Under the car, top end, or could i go from behind the seats and remove the plastic rear speaker trim?

 

Cheers guys!

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Surely a post-cat sensor is under the boot floor, after the cat ?

 

If you mean the sensor near the exhaust manifold, I think you need a decent crow's foot spanner or modified socket (Eliseparts sell one, or you can grind one), plenty of plus-gas and leave it to soak for a couple of days before it'll release.

 

Not sure you can get at it from above and I've never heard of anyone taking the bulkhead out to get to it.  Sound like a whole load of work !

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S2 just remove the rear diffuser, large 22mm spanner and your done in 5 mins. You can squeeze the connector block between the chassis and wheel arch trim.

 

Ps. Post cat sensor doesn't do anything apart from tell the ecu if the cat is working.

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