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Re: o2 sensor codes wont go off- aka check engine light keeps coming
Posted by siwyjohn (more from siwyjohn) on Mon, 19 Oct 2020 00:40:29
In Reply to: o2 sensor codes wont go off- aka check engine light keeps coming, Name Left Blank, Sat, 17 Oct 2020 17:09:50
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Those codes mean that the heater inside O2 sensor is damaged (typical issue). You have to replace it - the code will show up each time you reset the ECU, as it monitors heater resistance.
First sensor is regulating one - if it's old then even if it doesn't throw a code it can make your mpg really bad. Second is diagnostic one - it checks if your catalyst is working properly (it should have lower reading that the first one).
O2 sensor design (Bosch LSH) used in '99 is really outdated, so I would recommend to go into newer design - LSF or latest LSF Xfour. It turns on faster and has better response.
https://edisciplinas.usp.br/pluginfile.php/5138604/mod_resource/content/1/Lambda_poli.pdf
http://aa-boschap-ua.resource.bosch.com/media/__ua/parts/engine_systems__auto_parts_1/starters_alternators__engine_systems_1/gasoline__engine_systems_1/lambdasensor_imagefolder.pdf
Generally in this car you can put any heated O2 sensor with voltage output (but not the wideband ones, like Bosch LSU). Just connect the cables right :)
As for overheating - it is sometimes possible to repair old radiator, but usually it helps only for short time. Old radiator are usually eaten by salt and it's definitely a better idea to put a new one. Never use coolant system sealants! They can clog cooling circuit.
posted by 80.50.141...
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