Question about 1998 Ford Explorer

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1998 Ford Explorer v- 6 OHV Check engine light with code for too lean both banks 02 sensor. Have replced oxygen sensors four times. Have replaced muliple vacum lines including PCV hose. Have cleaned mass air flow sensor. Every time time I clear the code it will be back in approx. 7 to 14 days of every day driving. Any help would be greatly appreciated. I have had this problem for almost 2 years. The vehicle has 165000 miles.

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OK. Since you have had so much trouble lets check the dealer for an updated software calibration for the PCM (power train control module). Once we're sure there is no "fix" here lets talk about "lean" engine conditions. Lean means one of two things are wrong with the air fuel mixture (ideally 14.7 parts air to 1 part fuel). 1. Too much air -or- 2. Not enough fuel. If you access to a scan tool we need to look at fuel trims. With the engine warm look at this data on the scan tool. You have a "bank 1" and "bank 2" fuel trim data. Additionally, each bank has a long term and a short term value. With the Engine hot and at idle add the LT and ST trim value for bank1 and write it down...do the same for bank2. Repeat this step, for EACH bank with engine at 2500 RPM in park (hold at 2500 for at least 30 seconds so trims update). Now, you have the total trim values for each bank at idle and at 2500 RPM. What should the values be? Total trim +/- 5 is good, +/- 10 borderline any thing greater is code setting territory. If trim numbers are high at idle and in range at 2500 rpm you have a vacum leak behind the mass air flow sensor. Or a faulty MAF. Pay particular attention to the air inlet hose clamps behind (between MAF and engine) the MAF. Also use ford parts only.

Posted on Nov 14, 2009

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Sounds like there's too much air getting into the fuel system.
Get a can of starting fluid, with the engine running, spray the vaccum hose connections and fittings, and around the intake manifold, if the engine rev's up a little, you found the leak. This is not a fix, only a suggestion.

Posted on Nov 14, 2009

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P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

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Possible symptoms

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P1131 Ford Description

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Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

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