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aygomodder · 07-17-2021, 06:53 AM

Hi all,

I have a Toyota Aygo on gasoline and I want to retrofit a wideband O2 Sensor in it, to be able to make lean burn possible. I dont want to do any changes to ECU.

Idea: I read through sensors or OBD2 (with Arduino) throttleposition (0 – 100%) and RPM. If load < 45 and rpm between 1500 and 3000, I will return to the ECU a fake signal. If measured (real) AFR > 16, then I will report 0V, if below 16, I will report 1V. Otherwise I will return the normal AFR (I don't want to mess with it).

Questions:
1. does this make sense; I've read on some other cars that its possible but I think most will also modify their ECU (which I dont plan to do) . On the wiki there's an article called "Lean burn" by Oilpan 4 (1984 Chevy suburban 454 ) (I cant post links?) and it seems to agree.

2. will it blow up or damage my engine, or wreck the valves? I do not want to go crazy lean like some Hondas (20 AFR). 16 is good enough.

Rgs
Cas

07-17-2021, 06:53 AM	#1 (permalink)
aygomodder EcoModding Lurker Join Date: Jul 2021 Location: Holland Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Toyota Aygo Wideband O2 sensor retrofit & piggyback or OBD2 Hi all, I have a Toyota Aygo on gasoline and I want to retrofit a wideband O2 Sensor in it, to be able to make lean burn possible. I dont want to do any changes to ECU. Idea: I read through sensors or OBD2 (with Arduino) throttleposition (0 – 100%) and RPM. If load < 45 and rpm between 1500 and 3000, I will return to the ECU a fake signal. If measured (real) AFR > 16, then I will report 0V, if below 16, I will report 1V. Otherwise I will return the normal AFR (I don't want to mess with it). Questions: 1. does this make sense; I've read on some other cars that its possible but I think most will also modify their ECU (which I dont plan to do) . On the wiki there's an article called "Lean burn" by Oilpan 4 (1984 Chevy suburban 454 ) (I cant post links?) and it seems to agree. 2. will it blow up or damage my engine, or wreck the valves? I do not want to go crazy lean like some Hondas (20 AFR). 16 is good enough. Rgs Cas Last edited by aygomodder; 07-17-2021 at 07:11 AM..