96 4.9l P0171
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96 4.9l P0171
I have a 96 F150 4.9l throwing P0171
It was throwing more codes, and I have replaced both upstream O2 sensors and the canister purge valve. Now it only shows P0171 (lean bank 1) but not P0174 (lean bank 2).
I've cleaned the MAF and the air filter is good. Could the downstream O2 sensor be the cause? If not, what else would cause this?
If anymore info is needed, let me know. And thanks in advance.
It was throwing more codes, and I have replaced both upstream O2 sensors and the canister purge valve. Now it only shows P0171 (lean bank 1) but not P0174 (lean bank 2).
I've cleaned the MAF and the air filter is good. Could the downstream O2 sensor be the cause? If not, what else would cause this?
If anymore info is needed, let me know. And thanks in advance.
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Joined: Apr 2011
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From: Hartland, WI
Assuming this is a V8, the 302. You could have an intake gasket leaking, or a clogged/dead fuel injector. Do you have access to a live datastream on a scantool to watch short term fuel trims?
And no, a bad downstream O2 will not cause this. It's only purpose is to monitor catalyst efficiency.
And no, a bad downstream O2 will not cause this. It's only purpose is to monitor catalyst efficiency.
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Assuming this is a V8, the 302. You could have an intake gasket leaking, or a clogged/dead fuel injector. Do you have access to a live datastream on a scantool to watch short term fuel trims?
And no, a bad downstream O2 will not cause this. It's only purpose is to monitor catalyst efficiency.
And no, a bad downstream O2 will not cause this. It's only purpose is to monitor catalyst efficiency.
Thank you both.
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Dan71
Ford Inline Six, 200, 250, 4.9L / 300
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Mar 28, 2007 11:29 AM
