lambda sensor reading
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Joined: Jun 2021
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From: france moselle grand est
mercedes e55 amg 2004
lambda sensor reading
hello i need help! can you interpret this lamda probe reading with xentry das, having engine misfires I think I have a problem with these probes thank you in advance.
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Joined: Jul 2021
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From: Holt, FL
2004 Crossfire (w/M113K), 2008 Crossfire (w/M156), 2008 ML63, 2018 AMG GT
If your sensor capture was taken at idle or cruise, then the reading above would appear normal, as the ECU cycles the air/fuel mixture back and forth across the stoichiometric boundary. Your chart does not show RPM or load, so I would assume you took this capture at idle. The lambda sensor simply reads the presence (or lack of presence) of oxygen in the exhaust. It requires heat from the exhaust to operate (there is also a built in heater to help it get up to temperature more quickly). If there is no oxygen present then the sensor will produce a voltage, which to us means the mixture is rich. If there is oxygen present, indicating a lean condition, then the sensor will not produce a voltage. Typical stock type (narrowband) lambda sensors produce a voltage between 0-1v.
Thread Starter
Junior Member
Joined: Jun 2021
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From: france moselle grand est
mercedes e55 amg 2004
bonjour nemiro merci pour cette réponse rapide et très bien détaillée, ce qui veut dire que mon souci se trouve ailleurs, je pense au M A P capteurs mais je n'ai pas de code d'erreur et j'ai lu que cela pourrait provoquer des ratés et un ralenti désactivé sans annoncer le moindre code d'erreur ? Avez-vous une idée ? Merci.
Merci à Plutoe pour son aide.
Merci à Plutoe pour son aide.
Senior Member
Joined: Jul 2021
Posts: 310
Likes: 36
From: Holt, FL
2004 Crossfire (w/M113K), 2008 Crossfire (w/M156), 2008 ML63, 2018 AMG GT
I had a similar set of symptoms. It turned out to not be an electrical problem at all. It was the crank pulley separating. The pulley was visibly wobbling at idle. The ECU interpreted the inbalance of the engine as a misfire, and started setting codes and shutting down cylinders.
Thread Starter
Junior Member
Joined: Jun 2021
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From: france moselle grand est
mercedes e55 amg 2004
Hello nemiro desolé for the late reply, job obliges with the translator I have the word crank I assume you are talking about the crankshaft pulley? thank you.
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