Rick's Free Auto Repair Advice

Posts Tagged: EGR valve

EGR valve – When to replace

What does an EGR valve do and what goes bad? An exhaust gas recirculation EGR valve reduces pollution by sending a portion of the exhaust gasses back into the engine when the car is cruising at higher speeds. Engines need less fuel when they’re cruising. Since the engine cylinder is a fixed size, it must be filled with either a full dose of air and fuel, or a partial dose of air and fuel and the remainder with something that fills the space but doesn’t burn. Exhaust gas is the … Read More

EGR valve P0403 P0404

Fix code P0403 P0404 EGR valve If you get a P0403 or P0404 EGR valve code on a Dodge, Plymouth, or Chrysler vehicle you might want to replace the complete EGR assembly. But you don’t always have to. These two trouble codes are usually caused by a bad EGR transducer. The dealer doesn’t sell just the EGR transducer, making you buy the entire EGR valve. But Standard Motor parts now sells just the transducer so you can save money and avoid disassembling the entire valve and the EGR tube. Click here … Read More

What is an EGR valve?

What does an EGR valve do and can I delete my EGR? I often see car owners ask how to perform an EGR delete. Doing an EGR delete is a really bad idea. But in order to understand why, I first have to cover, “What is an EGR valve.” What does an EGR valve do? When the EPA first addressed air pollution, they directed their attention to the amount of unburned hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2), and oxides of nitrogen (NOx). By adjusting and monitoring air/fuel mixtures, … Read More

Fix P0405 EGR code on Chrysler

Fix code P0405 EGR code on Chrysler Products Many Chrysler products use EGR transducer to detect the actual movement of the EGR valve. The computer commands the EGR valve to open a certain amount. Then, the transducer measures exactly how far the valve actually opened. This transducer sensor has a very high failure rate. In most cases a P0405 EGR Sensor A Circuit Low is caused by a bad sensor. There are two way to go about this fix. You can buy a new EGR valve with sensor, or you … Read More

P0400 Nissan Altima EGR Malfunction

Fix code P0400 Nissan Altima EGR Malfunction Nissan’s P0400 Nissan Altima EGR Malfunction is similar to other manufacturers. The PCM pulses a solenoid to regulate how much vacuum the EGR valve gets. That determines how far the valve opens. To determine if the valve is actually opening, the PCM looks to the EGR backpressure transducer and the EGR temperature sensor. If you get the P0400 Exhaust Gas Recirculation Flow Malfunction code, first check to make sure the hose to the bottom of the EGR valve is intact and not burned. … Read More

P0401 EGR Code Dodge Caravan, Plymouth Voyager, Town and Country

Fix code P0401 EGR Code on Dodge Caravan, Plymouth Voyager, Town and Country 3.3L and 3.8L Shops are reporting consistent P0401 EGR Codes on 1996-2001 Chrysler minivans. These EGR valves are vacuum operated and the valve operation is measured by a pressure transducer. To check the EGR, start the engine and apply vacuum to the EGR valve. The valve should open, allowing exhaust to flow into the intake manifold. That should make the engine run rough or stall completely. If it does that, then the EGR valve itself is working. … Read More

P1408 EGR out of self test range

Fix code P1408 EGR out of self test range If you have a P1408 EGR out of self test range trouble code, this post will help you understand what it is and how to fix it. Exhaust Gas Recirculation valves (EGR) open and close to allow exhaust gas to flow into the intake manifold. The computer commands to valve to open and close in varying amounts. But since this is a mechanical valve, the computer needs to check to make sure the valve actually opened the correct distance. Some manufacturers attach … Read More

P0401 EGR insufficient flow – Chrysler Minivan

Fix trouble code P0401 egr insufficient flow – Chrysler Minivan Late model Chrysler Minivans are known to post P0401 egr insufficient flow codes P0401-P0408. The egr valve is like an electronic solenoid that pulls the pintel off its seat. A position sensor at the top of the valve measures how far the pintel shaft has actually moved versus how much the computer commanded it to move. It’s the position sensor that goes bad (see plunger in photo). The problem may be in the sensor, but the fix is in replacing the … Read More


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