- My model of MX-5 is:kuro
- I’m based near: Stafford __
- I’m looking for technical help or recommendations on:
Having power problems with my 62 plate Mazda MX5. I have replaced the air filter/ MAF , both CATs and lambda sensors and it’s still seeing a shortage of power ? Has anyone see this problem before ? Error code is below “Post Catalyst Fuel Trik SystemToo Lean Bank 1” ? Any help would be greatly appreciated
Possible leak into the intake air system resulting in too lean a mixture. Check all hoses and exhaust manifold for problems. Are any other codes showing at the same time or just P2096? Have you changed the spark plugs?
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Which “lambda sensor” did you replace? The upstream (air/fuel sensor) or downstream (oxygen sensor)?
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I will check the air intake, the exhaust manifold should be good as this has been replaced. It is just the one code showing . The spark plugs were changed 23’000 miles ago or two years ? Could they last that period of time, how often should they be replaced ?
The upstream lambda sensor was replaced , prior to the Catalytic converter ? Should I try both and are the sensors interchangeable? (Replaced sensor in yellow)
Plugs should be good for 60K so unless one of them has gone bad then they don’t need a change yet.
Please don’t spend money just changing parts, you need a proper diagnostic on all the possible failure points to track diwn just what the problem(s) is.
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Was the problem apparent before you replaced the manifold? If not then don’t ignore this as a possible culprit.
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Fuel filter??
The only filter on the nc is the sock on the fuel pick up in the tank. I would not have expected this to throw a fault code unless it was well blocked. But still an outside possibility. My money would still be on an air leak or the other cat sensor.
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Usually when it runs too lean it means an air leak as others have mentioned. Tighten and refit your hoses to make sure they are snug. If that doesn’t solve it, while the car is idling, spray WD40 around the induction system and associated hoses leading into the engine. If the revs start to change, the last thing you sprayed is around where the leak is.
Other reasons can be the sensor which you changed so is shouldn’t be that, a dodgy fuel filter which is always worth replacing anyways, or a hole / leak in your exhaust as the gas is leaving the engine. You will probably smell or hear the latter.
Have you replaced anything or disturbed the front Lambda sensor since fitting it…manifold etc?
I had a problem when I replaced my manifold and had to refit the lambda sensor. They seem to be very sensitive. Mine stopped working and bought up the same fault code. Since replacing it, the error code has gone. You can check the sensor with an OBD diagnostic reader, checking that on steady revs that you get a reading of approximately 0 milliamps on sensor 1 bank 1.
Hope this helps
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