P0171 and P0174 Codes - Don't Replace an Oxygen Sensor Before Reading This - Mobile Cell Deals
All about Mobile Cell Deals
sprint cell phone plans, sprint cell phone deals no contract, sprint cell phone deals upgrade, sprint cell phones, sprint cell phone coupons, sprint unlocked cell phones, sprint cell phone deals at best buy, nextel deals, sprint wireless accessories, sprint family plans and phones, sprint cell phone offers, at&t cell phone deals no contract, at&t cell phone upgrade deals, at&t cell phone plans, at&t cell phone plan deals, at&t iphone deals, at&t cell phones, at&t cell phone coupons, at&t cell phone service deals, verizon cell phone deals, verizon cell phone deals for existing customers, verizon cell phone deals for new customers, verizon cell phone deals without contract, verizon wireless, verizon cell phone deals on upgrade, verizon cell phone deals iphone 6, unlocked cell phone deals online, unlocked cell phone deals no contract, unlocked gsm cell phone deals, unlocked at&t, unlocked iphone, unlocked android cell phone deals, black friday unlocked cell phone deals 2016, black friday unlocked cell phone deals 2015, shopcelldeals location, shopcelldeals review, tracfone cell deals, shopcelldeals ebay, shopcelldeals coupon, shopcelldeals amazon, shopcelldeals customer service, shopcelldeals redemption code, best cell phone family plans, best unlimited cell phone plans, best cell phone coverage, best cell phone plans 2015 family, best cell phone deals no contract, no contract cell phone plans, best cell phone service, best cell phone plans for two, best cell phone plans 2016 family, alltel cell phone coupons, alltel free cell phones, alltel verizon cell phones, alltel cell phone plan, verizon cell phone deal, at&t cell phone deal, sprint cell phone deal, alltel tmobile, best cell deal 2015, best cell phone deal 2015, best cell deal 2016, compare phone companies plans, best cell phone deal no contract, best verizon cell phone deal, best cell phone deal 2016, best prepaid cell phone deal, best cell phone service deal, shop cell deals,
19397
post-template-default,single,single-post,postid-19397,single-format-standard,ajax_fade,page_not_loaded,,qode-theme-ver-7.6.2,wpb-js-composer js-comp-ver-4.6.2,vc_responsive

P0171 and P0174 Codes – Don’t Replace an Oxygen Sensor Before Reading This

05 Sep P0171 and P0174 Codes – Don’t Replace an Oxygen Sensor Before Reading This

So your car’s CEL (Check Engine Light) is on and you had the codes scanned at a local parts store. Your car has either a P0171, P0174 lean fault code or both stored in the computer, these codes are based on Oxygen Sensor (O-2) readings. A lean code or codes indicate that there’s too much oxygen in the exhaust. Remember parts stores have employees that have good intentions but they may not have the experience necessary to interpret what the trouble codes really mean. These codes are based on oxygen measurements in the exhaust. A common mistake with lean codes is to replace the oxygen sensors. This could be a very expensive mistake that will not fix the problem. Especially if both codes are present, because the chance of both O-2 sensors failing at the same time is very unlikely.

Most likely the cause is a vacuum leak. A vacuum leak can be caused from a vacuum hose, intake gasket or maybe even a leak in the air intake hose from the MAF (Mass Air Flow Sensor). Listen for a hissing sound that may lead you to the source of the problem. Some technicians will use a propane bottle with a hose attachment to help pinpoint vacuum leaks. With today’s computers it’s not quite as easy to check for vacuum leaks this way because the ECU (Electronic Control Unit) will compensate quickly for the added fuel and a change in idle is harder to notice. Oxygen sensor readings can be monitored with a scan tool while checking for leaks with propane, by looking for increased readings when enriching the mixture. Another way technicians can check for vacuum leaks is with a smoke test. By introducing smoke into a vacuum hose on the engine, the leak will be revealed when the smoke escapes from the problem area.

Aftermarket air filters that use oil on the element can sometimes damage the MAF. Over oiling the air filter may allow some excess to get on the MAF sensor wire or element. This can alter the reading, fooling the ECU into seeing more or less air flow therefore changing the air/fuel mixture incorrectly. I once worked on a car that would not start that had a problem with a MAF. When looking at the wire in the MAF, there was a burned piece of trash that made it’s way past the air filter. After cleaning the sensor the car ran perfectly. The ash that was on the MAF sensor wire was altering the reading by enriching the mixture so much that the car could not run. After talking with the customer, he said the air filter was just changed. This was obviously when some trash got into the air intake hose that settled on the hot wire of the MAF.

Fuel Pressure could also cause a lean condition. If the fuel filter is clogged or the fuel pump pressure is low, there could be higher level of oxygen in the exhaust also. Most of the time though, the ECU will compensate for the reduced fuel volume. So this is one of the least likely causes of a lean code.    

By Dennis Bandy

No Comments

Sorry, the comment form is closed at this time.