O2 senser trouble

SOURCE: Check Engine Light

It sounds like you may have a failing Mass Air Flow sensor, seems like Ive been seeing these tied together quite often. Its a little tricky but a good repair shop should be able to test this sensor. I dont want to tell you to replace it without having it tested cause they are a bit pricey but check around, you never know. Hope this give youu another idea where to look.

SOURCE: Check Engine Light - O2 Sensor - bank 1 running lean

you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

SOURCE: P0420 and check engine light

A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

SOURCE: finding truoble codes for 1994 suzuki sidekick

if you live in the states... just go to an autozone... they will scan the codes for free. you may also be able to retrieve the codes by turning the key off and on 3 times and counting the amount of times the check engine light flashes. almost like morse code... when you reach code 55 that's the end of the codes. this does not always work.

PAUL MC G

• 1280 Answers
• Posted on Oct 19, 2009

SOURCE: 2000 hyundai accent code 302 misfire and slow responce o2 senser

Yep!.. Typical with an engine cylinder misfire. Inspect the plug and ignition wire, especially the insulator. If you see a 'christmas tree' pattern on the insulator, that's where your problem is.