98 Explorer missing have p codes

MXRIDER39

MEMBER
1998 ALL OTHER MAKES ALL OTHER MODELS

I have a 98 explorer sport with a V6, with 88,000 miles on it. I have replaced plugs and plug wirers. The codes on the ODB II reader is p0303 and P1151. I have check the plug and wirer on #3 cilendar and I have spark. Am I looking at a bad injector? What about the other code says o2 sensor witch one?

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

I need to know whether its a dual or single exhaust for P1151 relating to heater O2 circuit cutting out on B2S1. A single has 2 sensors and a dual has 4

Also about PO303-when you changed the plug and wires does it continue to show? Could be a vac leak/burn exhaust valve/injector etc.

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Monday, May 7th, 2007 AT 2:30 AM

MXRIDER39

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3 POSTS

It is dual coming off motor then goes into single, then to kitty, then to muffler. I switched plug, and wire and it still comes up as misfire on cylinder 3. The p1151 code is telling me lack of HO2S21 switches sensor indicates lean.

Were do I go from here?

Thanks

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Monday, May 7th, 2007 AT 4:19 PM

MXRIDER39

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Just wondering if any body could help me?

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Tuesday, May 8th, 2007 AT 2:35 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

Pull the plug on cyl 3. Is it white? I have seen both injectors and coils go bad in those. Check for hot spark (blue) If got good spark, then Id go injector

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Tuesday, May 8th, 2007 AT 3:22 PM