Troubleshooting error P2238 P2239 P2252 P2253 SFI 1AZ-FE

From english:

Decoding the error P2238 from Toyota: Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)

Make:

Toyota

Code:

P2238

Definition:

Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)

Description:

Case 1: Condition (a) or (b) continues for 5.0 seconds or more: (a) The A1A+/A2A+ voltage is 0.5 V or less.(b) (A1A+/A2A+) — (A1A-/A2A-) = 0.1 V or less.Case 2: The A/F sensor admittance is below 0.022 1/Ω.

Cause:

• Open or short in A/F sensor (for Bank 1, 2 Sensor 1) circuit
• A/F sensor (for Bank 1, 2 Sensor 1)
• ECM

Symptoms of malfunction

The main driver symptom of P2238 is the MIL (Malfunction Indicator Light) illumination. It is also called Check engine or simply “check light”.

They can also appear as:

1. The “Check engine” warning light on the control panel will light up (the code will be stored in the ECM memory as a malfunction).
2. Additionally, misfire and lean/rich exhaust codes may be present.
3. Decrease in engine power.
4. The engine accelerates poorly, and vibration is also possible during acceleration.
5. Increased fuel consumption.

This DTC is considered serious. Because a shorted O₂ sensor can cause very poor engine performance and various drivability problems.

More category errors

P2239P2240P2241P2242P2251P2252P2253P2254P2255P2256P2401P2402P2418P2419P2420P2421P2422P2430P2431P2432P2433P2436P2437P2438P244 0P2441P2442P2443P2444P2445P2446P2447P2450P2451P2530P2601P2610P261BP261CP261DP2645P2646P2647P2714P2716P2725P2740P2741P2742P2743P2 757P2759P2769P2770P2772P2808P2810P2A00P2A03P3001P3002P3004P3005P3006P3009P3010P3015P3030P3060P3076P3077P3105P3115P3190P3191P3 193P0571/52P0341-747P0343-747P0516-769P0517-770P0560-117P060B-570P0617-142P062F-143P0630-804P082B-575P082C-576P082E-571P082F- 572P0851-579P0852-580P085D-582P085D-599P0861-597P0862-598P0A01-725P0A01-726P0A02-719P0A02-720See all errors →

How to Troubleshoot or Reset Trouble Code P2238

Some suggested steps to troubleshoot and fix error code P2238:

1. First, connect the OBD-II scanner to the vehicle's on-board computer and read all stored data and error codes.
2. Next, clear the error codes from the PCM memory and test drive the vehicle to see if P2238 appears again.
3. If the error code appears again, check the wires and connectors.
4. Test the sensor and replace if necessary.

Diagnosis and problem solving

Connect the scanner to the vehicle's diagnostic port and get all the stored codes. Then clean them and test drive the car. If the code does not appear, then the error was temporary. If it appears, continue testing.

Perform a visual inspection of the wiring and connectors associated with the oxygen sensor (HO2S). Replace damaged wiring or connectors if damage is detected. After that, reset the errors again, test drive and read them again.

If code P2238 occurs again, start the engine. Let it warm up to normal operating temperature at idle. Connect a scan tool to the diagnostic port and observe the oxygen sensor input data.

If the O₂ sensor is functioning normally, the voltage before the catalytic converter will continuously vary from 1 to 900 millivolts. The post-catalyst sensors will also cycle between 1 and 900 millivolts. A HO2S sensor that is not working properly should be considered faulty if the engine is in good working order.

If the HO2S sensor displays battery voltage or no voltage in the scanner data stream. Use a multimeter to obtain real-time data from the HO2S sensor connector. If the output remains the same, the HO2S sensor has shorted and will require replacement.

It may happen that after passing all the tests, the P2238 code is still displayed, this most likely indicates a faulty O₂ oxygen sensor. But a failed PCM module also cannot be eliminated until the sensor is replaced.

Errors in cars from different manufacturers

AcuraAlfa RomeoAudiBMWBuickCadillacChevroletChryslerDaewooDodgeEagleFIATFordGeneral MotorsGeoGMCGreat WallHondaHUMMERHyundaiInfinitiIsuzuIVECOJaguarJeepKiaLamborghiniLand RoverLexusLincolnMazdaMercedes BenzMercuryMINIMitsubishiNissanOldsmobileOpelPeugeot/C itroenPlymouthPontiacPorscheRAMRenaultSaabSaturnScionSubaruSuzukiToyotaVolga SiberVolkswagenVolvoVAZ (LADA)GAZ (GAZ)GAZ (Mikaz 11)GAZ (Mikaz 7.6)UAZ (Bosh ME17)UAZ Patriot (IVECO diesel)

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Technical description and interpretation of error P2238

A stored P2238 code means that the powertrain control module (PCM) has detected a low positive circuit signal in the O2 sensor 1 for engine block 1. To control the oxygen content in exhaust gases. As well as catalytic converter efficiency, the PCM uses input from heated oxygen sensors (HO2S).

Oxygen sensors are constructed using a zirconia sensing element located in the center of a vented steel housing. Small platinum electrodes are soldered between the sensing element and the wires in the oxygen sensor harness connector. The O₂ sensor harness connector connects to the Controller Area Network (CAN), which connects the O2 sensor harness to the PCM connector.

Each HO2S sensor is positioned so that the sensing element is closer to the center of the pipe. Exhaust gases enter the oxygen sensor through special holes in the steel housing and pass around the sensing element. The heated air causes oxygen ions to produce energy, which is recognized by the PCM as voltage.

When pulsating oxygen ions move between the platinum layers, changes in the HO2S voltage output occur. The PCM perceives these changes in the oxygen sensor output voltage as changes in the oxygen concentration in the exhaust gas.

If the PCM detects a voltage level that is not within acceptable parameters. DTC P2238 will be stored and the Malfunction Indicator Lamp (MIL) may illuminate.

Most vehicles will require several ignition cycles (failure) for the warning light to turn on.

Recommendations

Comments 22

I can solemnly congratulate you. You bought a Denso lambda. Denso is not an analogue, but what is in the original box. They may differ in housing. Only Denso is much cheaper.

I support the comment, I also came across the purchase of a sensor. Denso is much cheaper in a box

I bought two new Denso ones. And the ones I unscrewed from the old ones were Denso. I didn’t even doubt that it would be there. Almost all of them are Denso... it’s a daughter of Toyota.

I can solemnly congratulate you. You bought a Denso lambda. Denso is not an analogue, but what is in the original box. They may differ in housing. Only Denso is much cheaper.

And this is a matter of trust. Why do people insure their property? But they may not do this and it will be cheaper. The old sensor worked for 8 years and 200 thousand km. I like this kind of reliability and I want the new part to last just as long. And then, as you correctly noted, it would seem to be the same Denso, but for some reason it has differences in the body. And who will give a 100% guarantee that there is no difference in the thermal operating conditions of the sensor or that its parameters do not differ slightly for greater unification. In general, summing up the discussion, I can say that in our country, a country of victorious democracy, everyone has the right to their own opinion and freedom of choice. It is clear that a product without the automaker’s markings will be cheaper, but my choice is spare parts from the original spare parts catalog (often even better than those purchased from a dealer).

Good afternoon A year ago there was the same problem. I bought a probe on Ali Baba. Moreover, I corresponded with the seller for a long time so that I could sell one piece. Cost 12,000 tenge (2,200 rubles, $36). I didn’t have to solder anything, everything was like original. It's been working fine for a year. Consumption 11.5-12.5 in summer in city mode. Highway 8 l/100 km.

I think that Camry owners who will read this post may be interested in the brand and catalog number of such a wonderful substitute for expensive original spare parts.

The catalog number is the same as on the original, but there is no word Denso. There was no packaging box.

I think that Camry owners who will read this post may be interested in the brand and catalog number of such a wonderful substitute for expensive original spare parts.

Here is an extract from the PayPal payment.

Thank you for the information, but please note that the statement you posted shows the part number 89467-06070. According to Exista, this is indeed the first lambda, but only for cars from 06-09 and only American cars.

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I have a 2007, assembled in the USA.

Apparently this is why this sensor works properly on your car. And on mine there might have been an error (Peter, 2009)

Apparently you need a sensor with a different number. Go to the website and enter your number. I think there will be more than enough offers.

Yes, actually it’s no longer required))

I think that Camry owners who will read this post may be interested in the brand and catalog number of such a wonderful substitute for expensive original spare parts.

My personal opinion is that in the countries of victorious democracy, the main ideology has become trade and deception. And in most cases, “original Made in the USA, Germany, Japan,” began to simply bring a smile...

It was just irony. In no way did I want to offend you by mentioning the past of our country. We have something to be proud of when remembering the history of the country in which we were born and managed to live for some time. As for military acceptance, at that time not only military products could be subjected to it. At one time I had a Volga GAZ-24, which I restored from a state of complete scrap metal over the course of 2 years. So on this Volga, some spare parts (speedometer, switches, fuses) had the VP stamp. And what is typical on a 73 year old car they worked for more than 25 years without replacement. And by the way, this car also did not have any ECUs or associated sensors. And repairing and maintaining this car was as easy as a bicycle. Was it comfortable for me to operate the GAZ-24 - definitely yes, but would I like to switch from a Camry to a GAZ-24 today - most likely not. Cars today have become more convenient and dynamic, and as a result, more high-tech and probably less reliable than before. Additionally, the automaker is subject to requirements that were not previously of significant importance (ecology, etc.). But just like with the Volga, I want everything that should work for the car to work properly. The image of the Toyota brand for me is a guarantee that if, during repairs, instead of a faulty spare part I supply a serviceable one also with the Toyota marking, then the fault will definitely be eliminated. The risks associated with the use of various analogues fall entirely on me. And in my understanding, they are more research than repair work. As for the place of production, I essentially don’t care where the spare part is made, but if it bears the Toyota marking, in addition to the factory designation, then I consider it possible to use such a spare part in my car.

You are right, of course progress does not stand still. Regarding the fact that you offended me, it is impossible to offend me. I just really don’t like it when they insult our history and crap on the past. It's like insulting your ancestors and parents. After all, we love it so much... some sucker, sitting behind the wheel of a Priora bought by his dad, clutching a smartphone in his hands with a sideways grin, talks about the Second World War or the post-war period. Or, for example, smart people like to laugh at housing called “Khrushchev”. This may not be the crowning achievement of the architects, but! Housing was given free of charge, but in the age of the market it is sold at a wild price, plus a bonded loan called a mortgage! How is it better? I was once visiting a young family. One-room apartment! A source of pride! Studio! And what? During my student years, a dorm room! Only with a toilet and without a three-leaf wardrobe! Achievement of world architecture! And when I went to visit in Nuremberg, and it was a five-story building, and inside it turned out to be the same layout as in our “Khrushchev” buildings - I was amazed! There was no “Soviet occupation” in Nuremberg! Why be surprised? After the war, it was necessary to resettle the people and build budget housing! But! The Germans don’t blame their past! And they don’t squeal like pigs about how stupid everyone was before the advent of this particular generation. As for the Toyota brand marking on spare parts, I’ve only seen Denso...

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The Japanese concern Toyota creates high-tech cars. But this does not protect the product from problems with the system. Prado 120 4L error codes come to help the owner, which will tell you what to look for.

On which cars is this problem most common?

The problem with code P2238 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

• Acura
• Audi
• BMW
• Honda
• Hyundai (Hyundai Matrix, Starex)
• Kia (Kia Sorento, Soul)
• Lexus (Lexus rx330, rx350)
• Mazda
• Peugeot
• Skoda
• Toyota (Toyota Camry, Corolla, Crown, Prado, Prius, Rav4, Sienna, Tundra, 4runner)
• Volkswagen (Volkswagen Passat)

With fault code P2238, you can sometimes encounter other errors. The most common are the following: P2195, P2237, P2239, P2240, P2241, P2242.